Thanks Jim, I'm going to give this a try....
This isn't my idea, but it makes sense, I was reading this guys forum and he is adamant that the 7.5 Onan generator's dip stick is not marked correctly and when it's reading full it's too full without any room for oil expansion. He said he was having issues with his gen cutting off after it ran for a while. Eventually he withdrew a pint of oil which took it down to the quarter full mark. He said it ran for thirty some hours after that whith no issues. I'm going to try that, can't hurt !! My diesel mechanic who works on my 7.3 Ford always did tell me not to fill it to full line it will just blow it out somewhere.
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