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Re: "Meeting the spec" is the interesting part Posted by sam96CS [Email] (#852) [Profile/Gallery] (more from sam96CS) on Tue, 26 Mar 2013 16:38:33 In Reply to: Re: "Meeting the spec" is the interesting part, Noel, Tue, 26 Mar 2013 11:14:51 Members do not see ads below this line. - Help Keep This Site Online - Signup |
There is nothing in the SH specification that excludes synthetic oil stocks. The oil I use is synthetic and meets the SH specification.
There is nothing to prevent an oil from satisfying multiple specifications. The oil I use is approved for API service grades SH, SJ, SL and SM. I'm not giving up improvements in lubrication technology in order to meet the SH specification. I am also not giving up lubrication technology that is tried and true and was approved by Saab when my engine was built.
I'm not having problems with emissions-related parts due to running an oil that is fairly rich in ZDDP. My O2 sensors and Cat are original and going strong at 192K miles.
ZDDP matters mainly when the engine is cold, serving as a sacrificial coating on metal parts where there would otherwise be metal-to-metal contact at startup. After the engine is warm ZDDP doesn't matter at all except that it is forming a coating to preserve metal parts at the next cold start.
This benefit can be quantified in a lab and probably has been, but the SAE and API and oil companies aren't exactly deep wells of concrete and quantified information. Hence all the hype and debate and confusion. We're pretty much on our own to analyze what little solid information is available and draw our own conclusions. I've concluded that ZDDP is a Good Thing, and in 1996 Saab agreed. It may not be the only good emergency lubricant, but I see no need to experiment.
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