Quote:
Originally Posted by Camaroguy555
I was aching over which oil to use after reading a lengthy article by a mechanical engineer. I settled on the Quaker State Ultimate Durability 5w30 Full Synthetic even though I will be tracking it. The reason being the test conducted showed the Quaker had the best lubrication and pressure at 230 and also at 270 degrees. In his opinion it is the best out of the box oil you can use for performance applications.
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Hog wash, oil pressure will lower with temperature a 30wt oil will be thinner than 40wt at 230,270..pick any other hot temperature the 40wt will be thicker and thus higher oil pressure. Oil shearing is tested in an astm test called "ASTM D5481" HTHS values are usuallylisted on oils PDS . Dex 2 oils are 3.7+ range while dex1 being 3.0 range. higher hths the less the oil will loose it's viscosity with high temp high shear and return back to spec and not shear out of grade.
I would advise against what you have read but I'd like to take a look care to share a link?
I would follow GMs guidelines in respect to warranty and longevity.