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I used Red Line 5W40 for a few years with great success. Most recently I used Mobil 1's 5W50. Oil is hard to find. I am very happy with the results. I plan to run for another 1-2 years/oil changes. I expect my next UOA to be slightly better, yet again. If I decide to change oils again, I may use Motul. Right now I can say the Mobil 5W50 is even better than the Red Line (an excellent oil) I ran.
The only way to know "what oil is best" is to do UOA's.....in my opinion.
Lastly, Jake knows the answer to this question, but he will not awswer it (or has never in the past).
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