PS - The relevent section is in appendix G. I "think" it says that under
SM, only 0W-20, 5W-20, 0W-30, 5W-30, & 10W-30, are limited on sulfur &
phosphorus.
Dave
Dave Russell wrote:
> I sort of agree with Mike.
>
> However, in reading through the very confusing API standards, it
> appears that some weights of oils may somehow be rated SM & still have
> higher levels of Z & P. The oils which "have" to have reduced ZDDP,
> safe for catalytic converters, are the oils which would be used in
> newer engines, eg, 5W-20, 10W-30 etc. You have to read through a lot
> to find this.
>
>http://www.api.org/certifications/engineoil/pubs/upload/1509_16thedition042007.pdf
>
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