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Maintenance / Re: Synthetic oil or not
« on: September 02, 2015, 07:05:18 PM »
I've never used synthetic oil. I just had an engine built and my engine builder suggests that I go to synthetic. I'm debating whether or not to use it. The cost doesn't bother me. But what got my attention is that he said it would add 5-7 h.p. What do you think?