[Healeys] Engine Oils

[Bob Spidell]

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
--
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Bob Spidell         San Jose, CA        bspidell at comcast.net
'67 Austin-Healey 3000             '56 Austin-Healey 100M
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 -------------- Original message ----------------------
From: "Healey Bruce" <healeybruce at 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