EP1161513A1

EP1161513A1 - Engine oil composition with reduced deposit-formation tendency

Info

Publication number: EP1161513A1
Application number: EP00916867A
Authority: EP
Inventors: Alexander Dardin; Klaus Hedrich; Stephan Massoth; Boris Eisenberg; Stephan Fengler
Original assignee: RohMax Additives GmbH
Current assignee: Evonik Oil Additives GmbH
Priority date: 1999-03-04
Filing date: 2000-02-24
Publication date: 2001-12-12
Also published as: CA2372458C; CA2372458A1; CN1252232C; KR20020010120A; DE19909401A1; JP2002538266A; KR100454323B1; BR0008634A; CN1347444A; US6458750B1; AU3806400A; WO2000052117A1

Abstract

The invention relates to engine oil compositions with reduced deposit-formation tendency which contain between 0.05 and 10 % by weight, in relation to the total weight of the engine oil composition, of an alkyl alkoxylate of formula (I), in which R<1>, R<2> and R<3> independently are hydrogen or a hydrocarbon rest with up to 40 carbon atoms; R<4> is hydrogen, a methyl or ethyl rest; L is a linking group; n is a whole number between 4 and 40; A is an alkoxy group with between 2 and 25 recurring units derived from ethylene oxide, propylene oxide and/or butylene oxide and comprises homopolymers and statistical copolymers of at least two of the above compounds; and z is 1 or 2. The nonpolar part of compound (I) of the formula (II) contains at least 9 carbon atoms. The invention also relates to the preparation of such engine oils and to the use of alkyl alkoxylates of formula (I) for the reduction of deposit formation.

Description

Motor oil composition with reduced tendency to form deposits

The present invention relates to

Motor oil compositions with reduced tendency to

Formation of deposits as well as the use of

Alkyl alkoxylates.

According to the current state of the art, the crank mechanism, piston group, cylinder race and the valve control of an internal combustion engine are lubricated with an engine oil developed for this application. In the closed oil chamber of the engine, the engine oil, which collects in the oil pan of the engine, is conveyed to the individual lubrication points by means of a feed pump via an oil filter.

The motor oil has the following functions in this system:

=> Reduction of friction - reduction of wear

=> Cooling of components

=> Gas seal from the piston to the combustion chamber

The oil is exposed to the following loads during operation:

=> Contact with hot components (up to over 300 ° C)

=> Presence of air (oxidation), nitrogen oxides (nitration), fuel and its combustion residues (wall condensation, entry in liquid form) and soot particles from combustion (entry of solid foreign substances).

=> At the time of combustion, the oil film on the cylinder is exposed to high levels of radiant heat.

= The turbulence generated by the crank mechanism of the engine creates a large active surface of the oil in the form of drops in the gas space of the crank mechanism and gas bubbles in the oil pan.

The listed loads of evaporation, oxidation, nitration, dilution with fuel and the entry of particles change the engine oil itself and components of the engine which are wetted with engine oil during operation. As a result, the following effects occur which are undesirable for the correct operation of the engine:

1. Change in viscosity (in

Low temperature range, determined at 40 and 100 ° C)

2. Pumpability of the oil at low outside temperatures

3. Formation of deposits on hot and cold components of the engine

This means the formation of lacquer-like layers (color brown to black) up to the formation of coal. These deposits impair the function of individual components such as free movement of the piston rings and constriction of air-carrying components of the turbocharger (diffuser and spiral). As a result, there is serious engine damage or a drop in performance and an increase of exhaust emissions. Furthermore, a mud-like deposit layer is formed, preferably on the horizontal surfaces of the oil space, which in extreme cases can also clog the oil filter and oil passages of the engine, which likewise leads to engine damage.

4. Reduction of wear protection

To ensure trouble-free engine operation, the engine manufacturers stipulate a maximum service life of the engine oil (route or operating time until an oil change) and require proof of the performance of an engine oil in the form of test results from standardized test procedures and engine tests (e.g. API classification in the USA or ACEA test sequences in Europe) . In addition, procedures defined by the manufacturer are used to assess the suitability of engine oil.

Reducing the formation of deposits and ensuring high detergent and dispersibility over a long service life is of central importance in the above. Release procedure.

Example ACEA Test Sequences 1998:

Category A (petrol engines) -.

In 6 motorized test procedures 10 oil deposits, 4 times wear and 2 times the viscosity are determined. When determining the deposit behavior 4 is assessed 3 times piston cleanliness, 3 times piston ring sticking and 3 times sludge formation.

Category B (light diesel engines):

In 5 motor test procedures, 7 oil deposits, 3 times wear and 2 times the viscosity are determined. When determining the deposit behavior, 4 times piston cleanliness, 2 times piston ring sticking and once the sludge formation are assessed.

Category E (heavy diesel engines):

In 5 motorized test procedures, 7 oil deposits, 6 times wear and one viscosity are determined. When determining the deposit behavior, 3 piston cleanliness, 2 sludge formation and 1 turbo deposit are assessed.

The list shows that the formation of deposits is the most important element in the performance of an engine oil.

The use of detergents and dispersants in fuels and lubricants is unavoidable to avoid deposits and to control components that are insoluble in motor oil. Ionic, metal salt-containing (ash-giving) and non-ionic (non-ash-giving, 'ashless') compounds are usually used as detergents ('Chemistry & Technology of Lubricants', Mortier, RM, Orszulik, ST, Ed., VCH Publishers, Inc., New York).

The effect of these surface-active substances as a detergent or dispersant is based on theirs Amphiphilic character (polar-non-polar), which gives them properties similar to those of a conventional soap in water, but with the difference that they are oil-soluble. Due to the non-polar portion, which is usually formed by one or more longer, also oligomeric or polymeric alkyl radicals, sufficient solubility in the corresponding medium, for. B. a mineral or synthetic oil, while the polar portion is necessary above all for the amphiphiles to adhere to impurities.

Typical ionic classes of compounds are the alkyl sulfonates, phenates, salicylates and phosphonates with either calcium, magnesium or sodium as the counter ion. They are mainly used as lubricant detergents to prevent deposits and paint formation on e.g. Prevent or minimize pistons. They also often provide some protection against rust.

Non-ionic amphiphiles such as the poly (isobuylene) succinimide, poly (oxyalkylene) carbamates and polyamines and compounds derived therefrom have been used primarily as dispersants since 1950 to keep carbon black and other oil-insoluble oxidation products in solution. Their structure is similar to that of detergents, but here the polar part of the compound is formed by oxygen or nitrogen-containing hydrocarbon residues, such as poly (ethylene amines) or poly (ethylene oxides). The non-polar, oil-soluble part is usually of a polymeric nature, for example a poly (isobutylene) residue. For example, WO 84/04754 (US 4,438,022) describes a fuel and lubricant composition containing approximately 10000 ppm of a hydrocarbylmethylol polyoxyalkylene aminoethane, which is used both as a detergent and as a dispersant to keep the intake system in internal combustion engines clean.

Furthermore, WO 88/01290 discloses a polyalkylated succinimide, in which one or more nitrogen is substituted by a hydroxyhydrocarbyloxycarbonyl, as a detergent or dispersant in lubricating oils (engine, hydraulic, marine and two-stroke applications).

US 5,558683 explains Mannich bases consisting of a phenolic unit and a polyamine component, which in turn are connected to a poly (oxyalkylene) part via a urea bridge. Fuel and additive compositions are claimed which, due to the addition of the above. Connection allow control of the deposits in the ignition area ('induction system') of internal combustion engines.

GB-A-2 206 600 describes an additive formulation which serves to improve the viscosity index. Among other things, the a surfactant which has alkoxy groups. A reduction in the formation of deposits is not mentioned.

US 5,204,012 describes a lubricating oil composition containing an esterification product from the reaction of an ethylene oxide-propylene oxide block copolymer with a long chain fatty acid. This additive is used to inhibit corrosion. An effect with regard to the formation of deposits is not indicated.

In view of the prior art specified and discussed herein, it was an object of the present invention to provide engine oil compositions which show very little deposits.

In addition, the invention is intended to eliminate the disadvantage of the aforementioned systems, namely a rather complicated and therefore expensive production.

Furthermore, the stability of known compositions, systems or formulations is in need of improvement. This applies in particular since the motor vehicle manufacturers are constantly increasing the maintenance intervals after which the engine oil is replaced.

These tasks as well as others, which are not named literally, but which can be derived as a matter of course from the contexts discussed here, or which inevitably result from them, are solved by an engine oil composition as described in claim 1.

Preferred embodiments of the composition according to the invention are described in the claims which refer back to claim 1.

With regard to the manufacturing method, the subject matter of claim 11 provides the solution to the problem on which the object is based. The solution to the problem with regard to the use of alkyl alkoxylates is provided by the subject matter of claim 12.

In an engine oil composition according to the invention, the content of an alkyl alkoxylate of the formula (I) is 0.05-10% by weight, based on the total weight of the engine oil composition.

R ¹ - [- (CR ² R ³ ) _{n T} z- - A - R ⁴ < ^τ ><wherein

R ¹ , R ² and R ^{3 are} independently hydrogen or a

Are hydrocarbon residues with up to 40 carbon atoms,

R "is hydrogen, a methyl or ethyl radical,

L is a linking group, n is an integer in the range from 4 to 40,

A is an alkoxy group with 2 to 25 recurring

Units which are derived from ethylene oxide, propylene oxide and / or butylene oxide, where A

Homopolymers and random copolymers comprising at least two of the aforementioned compounds, and z is 1 or 2, the nonpolar part of the compound (I) of the formula

(II)

R ¹ - (CR ² R ³ ) _n - _JZ -L - ^{U τ) contains} at least 9 carbon atoms, in an unpredictable manner, to provide motor oil compositions with a reduced tendency to form deposits, the reduction of which Deposits used additives can be produced particularly easily and inexpensively.

By using an alkyl alkoxylate of the formula (I)

R'-f (CR ² R ³ ) _n -} - L - A - R ⁴ < ^{!) In}

R ¹ , R ² and R ^{3 are} independently hydrogen or a

Are hydrocarbon residues with up to 40 carbon atoms,

R * is hydrogen, a methyl or ethyl radical,

L is a linking group, n is an integer in the range from 4 to 40,

A is an alkoxy group with 2 to 25 recurring

Homopolymers and statistical copolymers of at least two of the aforementioned compounds, and z is 1 or 2, as an additive for motor oils for

Reduction of the formation of deposits, the aforementioned tasks also succeed in excellent, not easily predictable

Way to solve.

The following advantages are achieved in particular by the measures according to the invention:

The additive according to the invention

Compounds added to motor oil compositions to reduce the formation of deposits are very stable, so that the oil change intervals can be very long. The additives added to the engine oil compositions of the present invention to reduce scale formation are very effective.

According to the invention, the motor oil composition must have a compound of the formula (I)

R ¹ - [(CR ² R ³ ) _n ^{L ~ A- R4 (I}} 'wherein

R ¹ , R ² and R ^{3 are} independently hydrogen or a

Hydrocarbon residue with up to 40 carbon atoms,

R ^{4 is} hydrogen, a methyl or ethyl radical,

L is a linking group, n is an integer in the range from 4 to 40,

A is an alkoxy group with 2 to 25 recurring

(II)

contains at least 9 carbon atoms. In the context of the invention, these compounds are referred to as alkyl alkoxylates. These compounds can be used both individually and as a mixture. In the context of the invention, hydrocarbon radicals having up to 40 carbon atoms are to be understood as meaning, for example, saturated and unsaturated alkyl radicals, which can be linear, branched or cyclic, and aryl radicals, which can also contain heteroatoms and alkyl substituents, which may have substituents, such as halogens, can be provided.

Of these residues, (C ₁ -C ₂₀ ) -alkyl, in particular (C-- C _β ) -alkyl and very particularly (C.-C-alkyl residues) are preferred.

The term “(C ₁ - alkyl” is an unbranched or branched hydrocarbon radical having 1 to 4 carbon atoms, such as, for example, the methyl, ethyl, propyl, isopropyl, 1-butyl, 2-butyl, 2- Understand methyl propyl or tert-butyl;

under the expression “(C.-C ₈ ) alkyl” the abovementioned alkyl radicals, and for example the pentyl, 2-methylbutvl, I .T-dimethylpropyl, hexyl, heptyl, octyl, or the 1,1 , 3, 3-tetramethylbutyl residue;

under the expression “(C.-C ₂₀ ) alkyl” the abovementioned alkyl radicals, and for example the nonyl, 1-decyl, 2-decyl, undecyl, dodecyl, pentadecyl or eicosyl radical.

Furthermore, (C ₃ -C _β ) cycloalkyl radicals are preferred as the hydrocarbon radical. These include the cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl or cyclooctyl group.

Furthermore, the rest can also be unsaturated. Of these residues are "(C ₂ -C ₂₀ ) alkenyl", "(C ₂ -C ₂₀ ) alkynyl" and in particular "(C ₂ -C ₄ ) alkenyl" and "(C - C - alkynyl" are preferred. The expression "(C ₂ -C ₄ ) alkenyl" is, for example, the vinyl, allyl, 2 - Understand methyl -2-propenyl or 2-butenyl group;

under the expression "(C ₂ -C ₂₀ ) alkenyl" the abovementioned radicals and, for example, the 2-pentenyl, 2-decenyl or the 2-eicosenyl group;

under the expression "(C ₂ -C ₄ ) alkynyl", for example the ethynyl, propargyl, 2-methyl -2-propynyl or 2-butynyl group;

the term “(C ₂ -C ₂₀ ) alkenyl” is to be understood to mean the radicals mentioned above and, for example, the 2-pentinyl or the 2-decynyl group.

Furthermore, aromatic radicals, such as "aryl" or "heteroaromatic ring systems" are preferred. The term “aryl” is to be understood as an isocyclic aromatic radical with preferably 6 to 14, in particular 6 to 12, C-ato enes, such as, for example, phenyl, naphthyl or biphenylyl, preferably phenyl;

the term "heteroaromatic ring system" means an aryl radical in which at least one CH group has been replaced by N and / or at least two adjacent CH groups have been replaced by S, NH or 0, for example a radical of thiophene, furan, Pyrrole, thiazole, oxazole, imidazole, isothiazole, isoxazole, pyrazole, 1,3,4-oxadiazole, 1, 3, 4-thiadiazole, 1, 3, 4-triazole, 1,2,4-oxadiazole, 1, 2, 4-thiadiazole, 1, 2, 4-triazole, 1,2,3-triazole, 1, 2, 3, 4-tetrazole, benzo [b] thiophene, benzo [b] furan, indole, benzo [c] thiophene, Benzo [c] furan, isoindole, benzoxazole, benzothiazole, benzimidazole, benzisoxazole, benzisothiazole, benzopyrazole, 13

Benzothiadiazole, benzotriazole, dibenzofuran, dibenzothiophene, carbazole, pyridine, pyrazine, pyrimidine, pyridazine, 1, 3, 5-triazine, 1, 2, 4-triazine, 1,2,4,5-triazine, quinoline, isoquinoline, quinoxaline, Quinazoline, cinnoline, 1, 8-naphthyridine, 1, 5-naphthyridine, 1,6-naphthyridine, 1, 7-naphthyridine, phthalazine, pyridopyrimidine, purine, pteridine or 4H-quinolizine.

The radicals R ² or R ^{3 which} may occur repeatedly in the hydrophobic part of the molecule can each be the same or different.

The linking group L serves to connect the polar alkoxide part of the alkyl alkoxide according to the invention to the non-polar alkyl radical. Suitable groups include, for example, aromatic radicals, such as phenoxyl (L = -C ₆ H ₄ -0-), radicals derived from acids, such as, for example, ester groups (L = -CO-0-), carbamate groups (L = -NH-CO- 0-) and amide groups (L = -CO-NH-), ether groups (L = -0-) and keto groups (L = -CO-). Particularly stable groups, such as the ether, keto and aromatic groups, are preferred.

As mentioned above, n is an integer in the range from 4 to 40, in particular in the range from 10 to 30. If n is greater than 40, the viscosity which is produced by the additive according to the invention generally becomes too large. If n is less than 4, the lipophilicity of the part of the molecule is generally not sufficient to keep the compound of the formula (I) in solution. Accordingly, the non-polar part of the compound (I) of the formula (II) preferably contains a total of 10 to 100 carbon atoms and all particularly preferably a total of 10 to 35 carbon atoms.

The polar portion of the alkyl alkoxylate is represented by A in formula (I). It is believed that this portion of the alkyl alkoxylate is represented by formula (II I)

in which the radical R ^{5 is} hydrogen, a methyl radical and / or ethyl radical and m is an integer in the range from 2 to 40, preferably 2 to 25, in particular 2 and 15 and very particularly preferably 2 to 5. The abovementioned numerical values are to be understood as mean values in the context of the present invention, since this part of the alkyl alkoxylate is generally obtained by polymerization. If m is greater than 40, the solubility of the compound in the hydrophobic environment becomes too low, so that it can become cloudy in the oil, possibly precipitating. If the number is less than 2, the desired effect cannot be guaranteed.

The polar part can have units derived from ethylene oxide, from propylene oxide and / or from butylene oxide, with ethylene oxide being preferred. The polar part can have only one of these units. However, these units can also occur statistically in the polar remainder. The number z results from the choice of the connecting group or from the starting compounds used. It is 1 or 2.

The number of carbon atoms of the nonpolar part of the alkyl alkoxylate according to formula (II) is preferably greater than the number of carbon atoms of the polar part A, probably according to formula (III), of this molecule. The nonpolar part preferably contains at least twice as many carbon atoms as the polar part, particularly preferably three times or more.

The preparation of the alkyl alkoxylates depends, among other things, on the type of connecting group chosen. For example, additives with an ether group according to the invention are formed via the reaction of so-called fatty alcohols with ethylene oxide, propylene oxide and / or butylene oxide.

Furthermore, long-chain fatty acids can also be ethoxylated, for example. This creates esters.

If suitable phenols are used as the starting point, alkyl alkoxylates with an aromatic connecting group are obtained.

All of these reactions are known per se. The expert can find valuable information, for example, in Ulimann's Encyclopedia of Industrial Chemistry, Fifth Edition on CD-ROM, 1998 edition.

Many alkyl alkoxylates according to the invention which are suitable as additives for reducing the formation of deposits are commercially available. For this 16

include, for example, the ^® Marlipal and ^® Marlophen varieties from CONDEA and the ^® Lutensol types from BASF.

These include, for example, ^® Marlophen NP 3 (nonylphenol polyethylene glycol ether (3EO)), ^® Marlophen NP 4 (nonylphenol polyethylene glycol ether (4EO)), ^® Marlophen NP 5 (nonylphenol polyethylene glycol ether (5EO)), ^® Marlophen NP 6 (nonylphenol polyethylene glycol) (6EO);

^® Marlipal 1012/6 (C ₁₀ -C ₁₂ fatty alcohol polyethylene glycol ether (6E0)), ^® Marlipal MG (C ₁₂ - fatty alcohol polyethylene glycol ether), ^® Marlipal 013/30 (C ₁₃ -oxoalcohol polyethylene glycol ether (3EO)), ^® Marlipal 013/40 (C ₁₃ oxo alcohol polyethylene glycol ether (4EO));

^® Lutensol TO 3 (iC ₁₃ fatty alcohol with 3 EO units), ^® Lutensol TO 5 (iC ₁₃ fatty alcohol with 5 EO units), ^® Lutensol TO 7 (iC ₁₃ fatty alcohol with 7 EO units), ^® Lutensol TO 8 (iC ₁₃ fatty alcohol with 8 EO units) and ^® Lutensol TO 12 (iC ₁₃ fatty alcohol with 12 EO units).

The motor oil composition according to the invention contains 0.05 to 10% by weight of alkyl alkoxylates of the formula (I), based on the total weight of the mixture. If the amount is less than 0.05% by weight, the reduction in the formation of deposits is insufficient. The upper limit mainly results from economic considerations.

Motor oil in the context of the present invention is to be understood as oils which meet one or more of the performance requirements mentioned at the outset. The compositions according to the invention can also be regarded as motor oil formulations.

These oils generally have a base oil and one or more additives that are well known in the art.

In principle, any compound that provides a sufficient lubricating film that does not crack even at elevated temperatures is suitable as the base oil. To determine this property, the viscosities can be used, for example, as specified in the SAE specifications.

Particularly suitable are, inter alia, compounds which have a viscosity which is in the range from 15 Saybolt seconds (SUS, Saybolt Universal Seconds) to 250 SUS, preferably in the range from 15 to 100 SUS, in each case at 100 ° C.

The compounds suitable for this include natural oils, mineral oils and synthetic oils, and mixtures thereof.

Natural oils are animal or vegetable oils, such as claw oils or jojoba oils. Mineral oils are mainly obtained from crude oil by distillation. They are particularly advantageous in terms of their low price. Synthetic oils include organic esters, synthetic hydrocarbons, especially polyolefins, which meet the above requirements. They are usually somewhat more expensive than mineral oils, but have advantages in terms of their performance. These base oils can also be used as mixtures and are commercially available in many cases.

In addition to the base oil, engine oils generally contain additives. The additives cause a favorable flow behavior at low and high temperatures (improvement in the viscosity index), they suspend solids (detergent-dispersant behavior), neutralize acidic reaction products and the like. form a protective film on the cylinder surface (EP additive, for "extreme pressure"). In addition, anti-aging agents, pour point depressants, anti-corrosion agents, dyes, demulsifiers and odorants are used. The expert can find further valuable information in Ulimann's Encyclopedia of Industrial Chemistry, Fifth Edition on CD-ROM, 1998 edition.

The amounts in which these additives are used depend on the area of application of the lubricant. In general, however, the proportion of the base oil is between 25 to 90% by weight, preferably 50 to 75% by weight. The additives can also be used as DI packages (detergent inhibitor), which are widely known and can be obtained commercially.

In addition to that, particularly preferred motor oils contain

Base oil, for example

0.1-1% by weight pour point depressant,

0.5-15% by weight viscosity improver,

0.4-2% by weight anti-aging agent,

2-10% by weight detergents,

1-10% by weight lubricity improver, 0.0002-0.07% by weight of contraceptive, 0.1-1% by weight of anti-corrosion agent.

The motor oil according to the invention can be produced by mixing the components. Here, the alkyl alkoxylate of formula (I)

Engine oil composition directly, as part of the Vl improver, as part of the di-package, as part of a lubricant concentrate or subsequently added to the oil. Refurbished used oils can also be used as oil.

Lubricant concentrates which contain, for example, 5-95% of the alkyl alkoxylates of the formula (I), 95-5% of a lubricating oil and optionally 0-70% of a VI improver can also be used here.

The present invention is explained in more detail below with the aid of examples, which, however, are not intended to be limiting.

Assessment of deposit formation

The oil deposits are determined according to a visual procedure specified in DIN or CEC, in which the nature and thickness of the deposits are documented. With a key figure system for weighting the properties and thickness, an evaluation number of 0 -10 or 100 is determined for the individual component evaluated and as an average of all evaluated components an evaluation number for the entire engine and thus for the oil. 20th

"0" here means: totally covered with coal or mud, "10" or "100" clean like the new, unused part.

As shown in Example 1, the investigated additives have a positive effect on the formation of deposits in motor operation, shown here using the VWTDIC test as an example, which is part of the test scope of ACEA Category B.

Example 1 and Comparative Example 1

An engine oil composition B according to the invention was mixed by adding a non-ash-giving detergent according to the formula (I) (Marlipal 24/20) and in the CEC-L-46-T-93 engine test (1.61 VW Turbodiesel Intercooler) for its effect on preventing deposits examined. A corresponding, conventional composition A, which contained no alkyl alkoxylate of the formula (I) according to the invention, served as a comparison.

15W-40 compositions were mixed from the commercially available components listed in Table 1 and run in the CEC-L-46-T-93 test. The deposits formed in the engine were then evaluated according to the procedures listed above.

The results obtained are shown in Table 1. Table 1

OLOA 4594 from Oronite is a commercially available DI package which also contains ash-giving detergents which contain, for example, calcium, zinc, magnesium.

Paratone 8002 from Exxon / Paramins (recently Chevron / Oronite) is a commercially available oil improver for motor oils, which contains Olef incopoly ere (OCP).

Claims

claims

1. Motor oil composition with reduced tendency to form deposits, characterized by a content of 0.05-10% by weight, based on the total weight of the motor oil composition, of an alkyl alkoxylate of the formula (I)

R '- [(CR ² R ³ ) _n -Iz-L- ^{A ~ R4 (1)} ' wherein

R ¹ , R ² and R ^{3 are} independently hydrogen or a

Hydrocarbon residue with up to 40

Are carbon atoms,

R ^{4 is} hydrogen, a methyl or ethyl radical,

L is a linking group, n is an integer in the range from 4 to 40,

A is an alkoxy group with 2 to 25 recurring

Homopolymers and random copolymers of at least two of the aforementioned compounds, and z is 1 or 2, the nonpolar part of the compound (I) being the

Formula (II)

contains at least 9 carbon atoms.

2. Motor oil composition according to claim 1, characterized in that

L is an ether, ester or phenoxy group and n is between 10 and 30.

3. Motor oil composition according to claim 1 or 2, characterized in that the non-polar part of the compound (I) of the formula (II) contains a total of 10 to 100 carbon atoms.

4. Motor oil composition according to claim 3, characterized in that the non-polar part of the compound (I) of the formula (II) contains a total of 10 to 35 carbon atoms.

5. Motor oil composition according to one or more of the preceding claims, characterized in that the radical A has 2 to 15 recurring units which are derived from ethylene oxide, propylene oxide and / or butylene oxide.

6. Motor oil composition according to claim 5, characterized in that the radical A has 2 to 5 units which are derived from ethylene oxide, propylene oxide and / or butylene oxide.

7. Motor oil composition according to one or more of the preceding claims, characterized in that the non-polar part of the alkyl alkoxylate of the formula (II) contains more carbon atoms than the radical A.

8. Motor oil composition according to claim 8, characterized in that the non-polar part of the Alkyl alkoxylate of the formula (II) contains at least twice as many carbon atoms as the radical A.

9. Motor oil composition according to one or more of the preceding claims, characterized in that the radical A is derived from ethylene oxide.

10. Motor oil composition according to one or more of the preceding claims, characterized in that the composition

0.1-1% by weight pour point depressant,

0.5-15% by weight viscosity improver,

0.4-2% by weight anti-aging agent,

2-10% by weight detergents,

1-10% by weight lubricity improver,

0.0002-0.07% by weight anti-foaming agent,

0.1-1% by weight of anti-corrosion agent and

25 -90 wt .-% base oil, each based on the

Total weight of the mixture.

11. A method for producing an engine oil composition according to one or more of claims 1 to 10, characterized in that the alkyl alkoxylate of formula (I) of the engine oil composition directly, as part of the VI improver, as part of the DI package, as part of a

Lubricant concentrate or subsequently added to the oil.

2. Use of an alkyl alkoxylate of the formula (I)

R '- [- (CR ² R ³ ) _n LAR ⁴ _(I), wherein

R ¹ , R ² and R ^{3 are} independently hydrogen or a

Hydrocarbon residue with up to 40

Are carbon atoms,

R ^{4 is} hydrogen, a methyl or ethyl radical,

L is a linking group, n is an integer in the range from 4 to 40,

A is an alkoxy group with 2 to 40 recurring

Units that differ from ethylene oxide,

Derive propylene oxide and / or butylene oxide, wherein

A comprises homopolymers and random copolymers of at least two of the abovementioned compounds, and z is 1 or 2, as an additive to motor oils for

Reduction of the formation of deposits.

3rd Use according to claim 12 in an additive concentrate for motor oils.