Quote:
Originally Posted by JFP in PA
Castrol, like all the other majors, is under intense pressure from the OEM's to reduce or eliminate ZDDP from their formulations in order to help catalytic converters live longer (the OEM's are on the hook with the EPA to have to warranty converters for up to 80,000 miles. Zinc salts can shorten that life by irreversibly poisoning the converter media, as can other additives used in things like gas.)
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So while DT40 helps more with metal wear in the motor, at the same time it's killing the cats faster? Would it not be more prudent to simply use a good full synthetic and be vigilant about short interval oil changes? Four cats x $xxx ea. = ouchy.