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Both my m30s have a pitted cam lobe, very back.
I bought a used schrick 288 that also has the same pitted lobe. :/
Victims of shit oil like castrol gtx or $1.68 price range oil.
Nothing wrong with Castrol GTX, it's actually a good oil, just doesn't have enough ZDDP in it. Problem is, by the time you pay for 4qt of the Castrol and the quart of ZDDP, it's the same cost of running the Mobil1.
Also, when it goes on sale yearly (now) it is the best oil for the money, hands down. I run it in my 911, prob get a case or two to replenish my stock for the year.
I have been talking about Zinc here ever since I signed up. We have been building pushrod motors for years and have the same issue with flat tappets as the m20 does with the solid rockers.
Mobil1 15-50 has 1200ppm and is $25 from WalMart for an oil change.
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