re:
"I also spoke with David Nock, who uses Red Line
10W40. The viscosity of this oil is equivalent to a mineral-based 20W50"
Then the RL 10W-40 is mislabeled, IMO. The viscosity standards are, well,
standards
and a 10W-40 would never be "equivalent" to a 20W-50 based on viscosity (can any
petroleum engineers out there either back me up, or prove I'm full of it?).
re:
"Bottom line seems to be that
if it meets API SM standard, don't trust it in an old flat tappet engine."
Agreed. FWIW, I found a "stash" of my favorite--Chevron Supreme 20W-50--that
was still SL rated. I cleaned out the store, and they replaced it with SM rated
CS 20W-50.
bs
--
***************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
'67 Austin-Healey 3000 '56 Austin-Healey 100M
***************************************************************
-------------- Original message ----------------------
From: "Healey Bruce" <healeybruce@roadrunner.com>
> I spoke with Dave at Red Line last week. Red Lne 10W40 synthetic contains
> around 1250 ppm of ZDDP. All oils meeting API SM standards (the current)
> have between 600-800 ppm. I also spoke with David Nock, who uses Red Line
> 10W40. The viscosity of this oil is equivalent to a mineral-based 20W50,
> according to both David N and Dave (Red Line).
>
> Bruce Steele
> 1960 BN7
> Brea, CA
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