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Use of a Novel Non-Phosphorus Antiwear Additive for Engine Oils
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Abstract
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.
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Kristen, U., Müller, K., Chasan, D., Gandhi, H. et al., "Use of a Novel Non-Phosphorus Antiwear Additive for Engine Oils," SAE Technical Paper 872080, 1987, https://doi.org/10.4271/872080.Also In
References
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