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i had the head rebuilt 8k mile ago.. new guides, seats, valves. and seals. car has 125k. I removed the head and sent it back to the shop and nothing was found wrong. ran fine then one day number 2 just mis fired. removed plug and it had oil on it.. this is only after the engine warmed up. replaced the plug and same issue. leak down was working i used it on my land rover to check. starting to think oil ring and scraper ring are bad. i'm using recommed oil.. car was getting 40mpg and running like great.
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