A novel non-phosphorus antiwear additive, NP-1, was evaluated as a partial substitute for zinc dialkyldithiophosphate (ZDTP). ZDTP, an antiwear/antioxidant engine oil additive may under certain conditions cause three way catalyst (TWC) deactivation due to formation of an amorphous zinc pyrophosphate, Zn2P2O7, glaze. Antiwear and antioxidant properties of NP-1 alone and in combination with ZDTP were compared with ZDTP only containing formulations. The effects of NP-1 on TWC activity during pulsator modulation and steady-state conditions showed that the TWC maintained good overall activity during 24,000 simulated miles.
Use of a Novel Non-Phosphorus Antiwear Additive for Engine Oils
Sae Technical Papers
1987 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1987
1987-11-01
Aufsatz (Konferenz)
Englisch
Use of a novel non-phosphorus antiwear additive for engine oils
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