Hi Gary,
I thought I pointed out yesterday that there seem to be two categories
of SM service. Only the lighter oils which are likely to be used in
newer cars have to have reduced Zinc/ Phosphorus at this time. It
appears that 20-50, although rated SM, does not have to have to have the
reduced levels. I agree that the API specs and the oil companies'
preferences are at best very confusing & I really don't trust their
information. Just pointing out the loop hole in the specs that would
allow different ZDDP levels in oils rated SM.
It's kind of hidden in appendix G of this document.
http://www.api.org/certifications/engineoil/pubs/upload/1509_16thedition042007.pdf
Regards,
Dave Russell
Warthodson@aol.com wrote:
>There seems to be a conflict here. How can Castrol Snytec 20w50 be rated API
>service SM & also have the higher ZDDP levels of earlier service ratings &
>the higher ZDDP levels required by classic vehicles with flat tappets?
>Has anyone received a direct reply form Castrol concerning this?
>Thanks,
>Gary Hodson
>
>
>
>In a message dated 2/7/2008 10:00:22 A.M. Central Standard Time,
>3000mk3@bighealey.org writes:
>
>I just grabbed a bottle and it says API Service is SM/SL/SJ/CF
_______________________________________________
Support Team.Net http://www.team.net/donate.html
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
http://www.team.net/archive
|