I changed the oil last night to Mobile1 5w-20. I have not taken it out yet for a drive. I will report back. I read that there is a 4psi drop per 10 of oil weight.
I honestly don't remember what oil I used in my Bird. I just know I had one bottle of 20-50 laying around. I don't know If I put 1qt in or 6qt in. But the oil did seem pretty darn thick.
I don't know why I would have used a thick oil. Must have made sense at the time.
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