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Rebuilt engine “break-in” is the most critical period for long-term durability for a flat-tappet valvetrain.Zinc dialkyl dithio phosphate(ZDDP) has proven to be a cost-effective engine oil additive for anti-wear protection and oxidation resistance.But,tightening exhaust emission standards are requiring modern lubricants to have reduced levels of ZDDP additives.If the valvetrain break-in is successfully completed,then modern low-phosphorus lubricants can be used with confidence at subsequent oil change service intervals.
Rebuilt engine “break-in ” is the most critical period for long-term durability for a flat-tappet valvetrain. Zinc dialkyl dithio phosphate (ZDDP) has proven to be a cost-effective engine oil additive for anti-wear protection and oxidation resistance.But, tightening exhaust emission standards require for modern lubricants to have reduced levels of ZDDP additives.If the valve train break-in is successfully completed, then modern low-phosphorus lubricants can be used with confidence at subsequent oil change service intervals.