Deposit Control

o Ashless formulation

Eliminate metal-based overbase ft ant i wear agents o Use thermally stable base stocks o Base stock decomposition should yield volatile/ inert components o Additives should assist in deposit removal o WEAR

o Conventional additives not effective on ceramic surfaces o Dope ceramics with group V-VIII metal (ions) to increase surface concentration of antiwear agents o Develop new additives showing activity on ceramic surfaces o Additives must be active at both high and low temperatures o Additives should be ashless

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