Maximum allowable.
Bruce Steele
1960 BN7
Brea, CA
----- Original Message -----
From: Patton Dickson
To: Healey Bruce
Cc: Doug Newton ; healeys@autox.team.net
Sent: Friday, January 18, 2008 9:19 AM
Subject: Re: [Healeys] Engine Oils
Does meeting the standard for API SM mean that cannot have more that 800
ppm, or is it just a minimum standard. Has anyone ever asked API about their
standards and recommendations in regards to older engines?
On Jan 18, 2008 10:52 AM, Healey Bruce <healeybruce@roadrunner.com> wrote:
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). Bottom line seems to be
that
if it meets API SM standard, don't trust it in an old flat tappet engine.
--
Patton Dickson - http://Austin-Healeys.com - Plano, TX
1957 Austin-Healey 100-Six "Built to run 'til the road wears out."
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