I've tried searching through here to find it, but have come up with inconclusive results. Some say the increased ZDDP will eventualy kill your cat, others say that the increased calcium will offset that. What gives, especially in an oil burner. I believe it was CHJ, board member, that majorly reduced his consumption with Rotella 5w-40, even compared to HM 10w-40. Will an oil burning engine kill a catalytic converter faster with a HD mixed fleet oil? Also, some gas specific oils have as much, or more ZDDP and even calcium than 5w-40 Rotella. Wouldn't they kill your cat faster as well?
[ January 16, 2004, 06:59 PM: Message edited by: Drew99GT ]