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Originally Posted by badblack550xi
hmm 0W40 is good in winter but in summer you need something thicker, i would say 5w40 and 5W30
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Thats not true. Any high quality oil in the viscosities you mentioned are perfectly fine to run year round. Also, a 5w40 and a 0w40 are ultimately the same thickness when at operating temperature and most 5w30s will actually be thinner than a 0w40 during cold start. Confusing huh?