
Originally Posted by
lost_soul
I live in upstate ny and winters are brutal so I run heavier to help with the cold morning starts
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Its totally opposite, when cold you need that first number lower, not higher. Ideally zero, as in 0w40. That helps oil to get to the top of the engine faster on a cold start. Fully synthetic oil 5W-anything is not bad for cold either, but 0 is ideal.
As for the original question, I tend to agree that M1 0W40 European formula is the best. M1 5W30 is the worst. Anything else like Castrol, Valvoline, Rotella T6 are somewhere in between. Only oil where my 140K miles Stage 3 2.7t 01 consume almost no oil, maybe half a quart between changes.
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