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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