On Fri, 5 Jun 2009, Barr, Scott wrote:
> I've got half a case of SL-rated Castrol GTX 20w50 on the shelf. Did
> the oil manufacturers switch to the SM rating at the same time as the
> ZDDP content was dropped? I.e., what are the chances this oil has the
> proper ZDDP content?
If you want to split hairs, you really want API SG. The reduction started
then.
But oil that has the SL rating has been sitting "for a while" (like 10
years) and the additives package is most likely not as effective as new
oil would be, e.g. it's not fresh.
> Scott ( who has some Redline ZDDP additive to drop in just to cover all
> the bases)
rml
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Bob Lang NER/SCCA | This space for rent
Solo Chair 2008 TR6 40 F Prepared | Triumph!
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