Low ash lubricant compositions for internal combustion engines

A lubrication oil additive package concentrate which comprises:

• (A) from about 10 to 40 weight percent of at least one oil soluble ashless disputant selected from the group consisting of (i) oil soluble salts, amides, imides, oxazolines and esters, and mixtures thereof, of long chain hydrocarbon substituted mono and dicarboxylic acids or their anhydrides or esters;
• (ii) long chain aliphatic hydrocarbon having a polyamine attached directly thereto;
• (iii) Mannich condensation products formed by condensing about a molar proportion of long chain hydrocarbon substituted phenol with about 1 to 2.5 moles of formaldehyde and about 0.5 to 2 moles of polyalkylene polyamine;
• and (iv) Mannich condensation products formed by reacting long chain hydrocarbon substituted mono- and dicarboxylic acids or their anhydrides or esters with an aminophenol or a hydrocarbon substituted aminophenol, to form a long chain hydrocarbon substituted amide or imide-containing phenol intermediate adduct, and condensing about a molar proportion of the long chain hydrocarbon substituted amide- or imide-containing phenol intermediate adduct with about 1 to 2.5 moles of formaldehyde and about 0.5 to 2 moles of polyamine wherein said long chain hydrocarbon group in (i), (ii) and (iii) is a polymer of a C.sub.2 to C.sub.10 monoolefin, said polymer having a number average molecular weight of about 1,000 to about 5,000;
• (B) from about 3 to 40 weight percent of at least one oil soluble antioxidant material;
• and
• (C) from about 5 to 15 weight percent of at least one oil soluble dihydrocarbyl dithiphosphate material, wherein each hydrocarbyl group has, on average, at least 3 carbon atoms;
• and
• (D) from about 30 to 80 weight percent base oils wherein the total sulfated ash value in said additive package concentrate (SASH) and the concentration of said ashless dispersant in said concentrate is from about 0.01 to 0.2 parts by weight of SASH per part by weight of said ashless dispersant.

A low sulfated ash heavy duty diesel crankcase lubricating oil composition prepared by admixing a major amount of an oil of lubricating viscosity with

• (A) at least about 2 weight percent of at least one oil soluble ashless dispersant selected from the group consisting of
• (i) oil soluble salts, amides, imides, oxazolines and esters, and mixtures thereof, of long chain hydrocarbon substituted mono and dicarboxylic acids or their anhydrides or esters;
• (ii) long chain aliphatic hydrocarbon having a polyamine attached directly thereto;
• (iii) Mannich condensation products formed by condensing about a molar proportion of long chain hydrocarbon substituted phenol with about 1 to 2.5 moles of formaldehyde and about 0.5 to 2 moles of polyalkylene polyamine;
• and
• (iv) Mannich condensation products formed by reacting long chain hydrocarbon substituted mono- and dicarboxylic acids or anhydrides or esters with an aminophenol or a hydrocarbon substituted aminophenol, to form a long chain hydrocarbon substituted amide or imide-containing phenol intermediate adduct, and condensing about a molar proportion of the long chain hydrocarbon substituted amide- or imide-containing phenol intermediate adduct with about 1 to 2.5 moles of formaldehyde and about 0.5 to 2 moles of polyamine
• wherein said long chain hydrocarbon group in (i), (ii), (iii) and (iv) is a polymer of a C.sub.2 to C.sub.10 monoolefin, said polymer having a number average molecular weight of about 1,000 to about 5,000;
• (B) an antioxidant effective amount of at least one oil soluble antioxidant material;
• and
• (C) at least one oil soluble dihydrocarbyl dithiophosphate material, wherein each hydrocarbyl group has, on average, at least 3 carbon atoms;
• wherein the lubricating oil composition comprises a total sulfate ash (SASH) level of less than 0.6 weight percent and the weight ratio of SASH weight to the weight of ashless dispersant admixed is from about 0.01:1 to about 0.2:1.

A lubricating oil additive package concentrate prepared by admixing

• (A) from about 10 to 40 weight percent of at least one oil soluble ashless dispersant selected from the group consisting of
• (i) oil soluble salts, amides, imides, oxazolines and esters, and mixtures thereof, of long chain hydrocarbon substituted mono and dicarboxylic acids or their anhydrides or esters;
• (ii) long chain aliphatic hydrocarbon having a polyamine attached directly thereto;
• (iii) Mannich condensation products formed by condensing about a molar proportion of long chain hydrocarbon substituted phenol with about 1 to 2.5 moles of formaldehyde and about 0.2 to 2 moles of polyalkylene polyamine;
• and
• (iv) Mannich condensation products formed by reacting long chain hydrocarbon substituted mono- and dicarboxylic acids or their anhydrides or esters with an aminophenol or a hydrocarbon substituted aminophenol, to form a long chain hydrocarbon substituted amide or imide-containing phenol intermediate adduct, and condensing about a molar proportion of the long chain hydrocarbon substituted amide- or imide-containing phenol intermediate adduct with about 1 to 2.5 moles of formaldehyde and about 0.5 to 2 moles of polyamine
• wherein said long chain hydrocarbon group in (i), (ii) (iii) and (iv) is a polymer of a C.sub.2 to C.sub.10 monoolefin, said polymer having a number average molecular weight of about 1,000 to about 5,000;
• (B) from about 3 to 40 weight percent of at least one oil soluble antioxidant material;
• (C) from about 5 to 15 weight percent of at least one oil soluble dihydrocarbyl dithiophosphate material, wherein each hydrocarbyl group has, on average, at least 3 carbon atoms;
• and
• (D) from about 30 to 80 weight percent base oils wherein the total sulfated ash value in said additive package concentrate (SASH) and the concentration of ashless dispersant admixed to prepare said concentrate is from about 0.01 to 0.2 parts by weight of SASH per part by weight of said ashless dispersant.