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I would use Red Line 5W-40 oil. For your application, I consider it superior to the M1 0W-40. This oil will cover you in summer and winter and frankly, if you race the car too.
M1 is good, Red Line is better, based on the data sheets and used oil analysis.
I would NOT use 15-50 weight oil UNLESS you are actually tracking the car hard.
Do NOT use a straight weight oil in the car, period.
Those are the only two oils I would recommend at this time.
Good luck.
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Rich Belloff
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