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I doubt the oil is to blame but I dont agree with John on using old fashioned oil, a modern multi grade (15/40, or 15/50) is fine just avoid synthetics and semi synthetics, as they dont cool air cooled engines as well. I would change the oil pressure sensor first and see what happens.

“I would change the oil pressure sensor first and see what happens.”

you read my mind! see original post.

Thanks for the advice Keith