[Healeys] Oil article abour ZDDP- PS

[Dave Russell]

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