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Yea but just thinking i live in upstate NY it can get down to like 10 in the winter wouldn't the 5w-30 thin out to much when its cold like that.
that is the whole idea behind the 5w and 10w. These are the winter temp ratings, 5w flows easier at lower temps. So you get better lubrication (less friction) quicker. Once the engine starts to come up to normal operating temps, the 5w and 10w are going to flow the same.
I live outside of Boston and have very similar temps. It's been 5w synthetic for my 02 ES since I bought it.