List---More info on the modern oil with reduced
zddp. Looks like it's OK, with the included exception. Read on...
Dick
Sender: robert.montgomery@shell.com (<robert.montgomery@shell.com>)
From: PrdMktTechServices@shell.com(<PrdMktTechServices@shell.com>) ,
Subject: RE: Older Oil
Dear Consumers,
Thank you for your inquiry.
With the introduction of API "SM" quality motor oils, the zddp anti-wear
additive was reduced by approximately 25%. The anti-wear levels of "SM"
oils will properly protect most engines with "flat tappet" followers.
The exception would be engines that have very high lift cams along with
very high tension valve springs. For this type of application I would
recommend using an API "SL" rated oil, a diesel engine oil rated at API
CJ-4, or for racing enthusiast the Pennzoil 25W-50 Racing Motor Oil.
Best Regards,
Technical Service
-----Original Message-----
From: Sally or Dick Taylor [mailto:tr6taylor@webtv.net]
Sent: Thursday, April 17, 2008 8:20 PM
To: PrdMktTechServices, SLUBE-OGML/1
Subject: Older Oil
I'm concerned about what appears to be the decrease in the amount of
Zinc and Phosphate in the modern SM oils. Altho your site says that the
SM includes all of the properties of the older oils, others say that
this ZP additive has ben greatly reduced in favor of longer catalitic
converter life.
Having a classic flat tappet engine, should I be worried?
Thanks!
Dick Taylor
73 TR6
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