I thought I would ask around the community and see if any one else has noticed an increasing number of wiped cam lobes and lifters on flat tappet vehicles lately. I’ve had a rash of customers in the past 6 months come in the shop with wiped cam lobes on stock vehicles. As far as I can tell these vehicles have been maintained well, with regular oil changes. Before this, the only vehicles I saw come in with this problem were guys with performance motors and stiff valve springs who did not break the motors in properly. I know the amount of Zinc and Phosphorous in motor oil has rapidly declined since the “old days” but I can’t seem to get a straight answer on exactly when the oil producers started reducing ZDDP in motor oil. Reduced ZDDP levels are the only thing I can attribute to these failures; I just thought it was weird that I have noticed so many in the past year. Anyways, what do you guys think? Thanks!
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