> There are Not street legal versions of both petroleum and
> synthetic VR1's. hard to find and expensive.
I was just looking at Valvoline's web site, and it lists only one "Valvoline
Specialty Racing Oil (Not Street Legal)" (which does not say "VR1").
http://tinyurl.com/6hegkdb
But it apparently has the same amount of ZDDP as both VR1 and VR1 synthetic.
Note that VR1 and VR1 Synthetic meet several API standards
(SH/SL/SM/SN/CD/CF) while the NSL stuff does not. I'm guessing that means
the NSL doesn't have as many "long life" additives like detergents and
anti-corrosion as VR1 does. The NSL also lists TBN less than 6 (which could
mean 0), while VR1 lists TBN=8.5.
BTW, Amazon lists Valvoline NSL at $40/case of 6. Not exactly cheap, but
about what you'd pay for VR1 Synthetic in most stores.
-- Randall
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