Blending method for improved compatibility of dispersants and basic magnesium detergents in DI packages

A method for preparing a lubricating oil DI additive package comprising an oil soluble nitrogen or ester containing lube oil ashless dispersant, a basic magnesium containing detergent, and one or more additional additives for imparting oxidation resistance and wear resistance wherein the ashless dispersant and basic magnesium detergent exhibit improved compatibility in the package, said method comprising the steps of:

• (1) preparing a mixture comprising (a) the dispersant:
• (b) the detergent;
• and (c) a substantially inert solvent;
• (2) blending said mixture at a temperature within the range of about 150.degree. to about 350.degree. F. for a period of time sufficient to render the mixture substantially free of haze and sediment;
• said mixture prepared in step (1) being essentially free of other additive ingredients susceptible to thermal decomposition in said blending of step (2);
• and (3) incorporating said other additives into the blended haze- and sediment-free mixture wherein said dispersant comprises a succinimide and said detergent comprises an overbased magnesium alkylbenzene sulfonate.

A method for improving the compatibility of oil soluble nitrogen or ester containing lube oil ashless dispersants and basic magnesium sulfonate detergents in DI packages incorporating these materials plus other additives imparting properties comprising oxidation resistance and wear resistance, said method comprising:

• (1) preparing a mixture in which there is measurable haze and sediment, said mixture consisting essentially of (a) a magnesium sulfonate detergent having a TBN of about 150 to about 500;
• and (b) a borated or non-borated ashless dispersant consisting of a succinimide dispersant;
• and (c) substantially inert solvent;
• and (2) blending said mixture at a temperature of about 150.degree. F. to about 380.degree. F. for a period of time sufficient to render the mixture substantially free of said haze and sedient.