Motor oil with high dispersivity and good wear protection characteristics

A motor oil or transmission oil of a commercial SAE single- or multi-viscosity class, which contains polymeric additives and which has high dispersivity and good wear protection characteristics, said oil comprising the following additives:

• (i) at least one heavy-duty antioxidant or wear protective agent comprising a phosphorus containing antioxidant and antiwear compound;
• and
• (ii) an oligomeric or polymeric compound, which functions as a dispersing agent, comprised of:
• (a) units of alkyl(meth)acrylates of formula I
• wherein R represents hydrogen or methyl, and
• R1 represents an alkyl group with 4-34 C atoms, said tits of formula I being present in the amount of 60-99.5 parts by weigh, based on the total weight of monomers in the oligomeric or polymeric compound, and
• (b) units of at least one funtionalized alkyl(meth)acrylate of formula II
• where R1 represents hydrogen or methyl, and
• R2 represents an alkyl group having 2-6 C atoms and substituted with at least one OH group, or R2 represents an alkoxylated group of the formula
• where R3 and R4 each represent hydrogen or methyl,
• R5 represents an alkyl or alkyl group having 1-40 C atoms, and
• n is an integer ranging from 1-60 and if n≧2, then R5, in addition, may be hydrogen, said units of formula II being present in the amount of 0.5-40 parts by weight, being present, based on the total weight of monomers I and II in the oligomeric or polymeric compound,
• (c) units of one or more monomers of formula III
• where R″ represents hydrogen or methyl, and
• R6 represents an alkyl group with 1-5 C atoms, said units of formula III being present in the amount of 0-20 parts by weight, based on the total weight of monomers I and II in the oligomeric or polymeric compound, and
• (d) units of 1-alkenes of formula IV
• CH2=CHR7 (IV)
• where R7 represents an alkyl group having 2-40 C atoms, said units of formula IV being present in the amount of 0-50 parts by weight, based on the total weight of monomers I and II in the oligomeric or polymeric compounds;
• with the following provisions:
• (1) the units of formulas I and II together comprise 100 wt. %,
• (2) the content of component (ii) in the motor or transmission oil ranges from 0.5-50 wt. %, and
• (3) wherein phosphorus content of the motor- or transmission oil is 0.043 to 0.68 wt. %.