Just when I thought this made sense ...
I re-read it and this can be parsed as "the CURRENT formulation has
boosted zinc levels" but the "NEW formula" has "Recommended for Classic
Cars" on the label (I'm sure our cams and tappets will be glad to hear
that ;)
I think "Current" and "new formula" must be the same, but???
Kudos to Castrol for trying (I think).
bs
Warthodson@aol.com wrote:
>
> The new formula Syntec 20W-50 for classic cars is API SM. The statement
> "Recommended for Classic Cars" should be visible in the middle of the back
> label.
>
> The Zinc levels in the API SM / ILSAC GF-4 viscosity grades are defined by a
> table of requirements but in basic terms 20W-50 is not held to the same
> requirements as the lower viscosity grades (5W-20, 0W-30, 5W-30, 10W-30);
> 20W-50 can be higher.
>
> Current Syntec 20W-50 (for classic cars) is actually a modern premium
> quality API SM product that has been Zinc boosted to Zinc levels that are
> reminiscent of Zinc levels from historic API categories such as SG when flat
> tappet cams with high spring loads were common in the fleet. The API SM
> category has the most rigorous passenger car engine oil (PCO) test
> performance requirements in the history of the API PCO categories.
>
> Castrol Consumer Relations
>
>
***************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
'67 Austin-Healey 3000 '56 Austin-Healey 100M
***************************************************************
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