A fully formulated lubricating oil, lubricated surface, and lubricant additive concentrates for lubricants providing reduced sludge formation. The fully formulated lubricating oil composition has therein at least one succinimide dispersant, a metal containing detergent, at least one antioxidant, and a hydrocarbon soluble titanium compound. The lubricating oil has improved sludge reducing properties compared to the same lubricating oil composition devoid of the titanium compound.