This is interesting. I was unaware that the limit only applied to the lighter viscosities. This was the source of my confusion. -Wes Mike S wrote: > > The limits placed on phosphorus and sulphur content by the API SM spec > only apply to weights 0W-20, 5W-20, 0W-30, 5W-30, and 10W-30. None of > those weights are suitable for a VW. There is no limit on zinc, except > indirectly as a part of ZDDP, which is due to the phosphorus limit. > > This is found on page 61 of this API document: > http://www.api.org/certifications/engineoil/pubs/upload/1509_16thedition042007.pdf > > |
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