OVERKILL
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Originally Posted By: Trav
I understand some say the 0w part of the oil only means it has better cold start properties but then why on the Tundra for example wont they allow 0w20 but 5w2o is fine.
Likely the same reason Honda spec'd 10w-30 instead of 5w-30 for the S2000: shear. Not all 0W-xx's are equally shear stable or have the same HTHS, so it is possible that some of them may end up too far out of grade. Mobil appears to specifically test for that, hence their recommendation, which they wouldn't make if they didn't feel the product was shear stable enough to be used in place of those others.
I understand some say the 0w part of the oil only means it has better cold start properties but then why on the Tundra for example wont they allow 0w20 but 5w2o is fine.
Likely the same reason Honda spec'd 10w-30 instead of 5w-30 for the S2000: shear. Not all 0W-xx's are equally shear stable or have the same HTHS, so it is possible that some of them may end up too far out of grade. Mobil appears to specifically test for that, hence their recommendation, which they wouldn't make if they didn't feel the product was shear stable enough to be used in place of those others.