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Originally Posted by jkv357
Not sure how it's figured exactly, but the claim is that the 0W-30 will flow easier than a 5W-30
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Sure. It flows better when cold.
Warm performance is the same though (W30).
Quote:
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Any time it's cold (15 is cold) the 0W will be a better choice than the 5W for reduce engine wear at start-up. Not sure if you'd actually see a mileage improvement with it (they claim up to 2% increase).
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It doesn't often get below 15F here either, but you don't need these cold temps to note the difference. It works just as well after a cold engine start.
Originally, my Volvo V50 used 5W30, then the dealership put in 0W30 in it.
It immediately ran quieter and smoother after start-up, so I stuck with it.
The V50 also runs smoother, quieter, and uses considerably less fuel after a cold start, compared to the loaner S40 on 5W30 I had for a few weeks - despite the loaner S40 doing about 10% better for overall FE !
(The V50 and S40 are technically the same, aside from the body shape and mirrors.)