[Healeys] FW: Castrol Syntec

[Dave Russell]

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 at 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 at bighealey.org writes:
>
>I  just grabbed a bottle and it says API Service is  SM/SL/SJ/CF