Posted by sotxbill on April 28, 2023 at 07:47:13 from (172.59.232.88):
In Reply to: Re: Power Major oils posted by Majorman on April 27, 2023 at 23:47:42:
Your interpretation and mine intersect somewhere. Are you saying the 20w50 is preforming better due to worn out engine and high clearances? Or due to reduced zinc phosphorus additives for newer emissions specs? Or that is has less alkali additives (redundant). Trying to find the answer here as to why 20w50 leaks less than 15w40. Its either viscosity or your comparing early oils packages to later emission oil packages? Oils of the same api rating other than viscosity will have an almost identical additive packages. Today they buy the additive package from a few certified providers now instead of having their own labs and unique packages as in the early days. They save the testing and certification costs. Only the base oil mix will vary or viscosity improvers will change slightly. Your 20w50 will demonstrate only a viscosity change within that class of oil. People with leaky engines want to know what magic you pulling from your hat. What is this oil... that stops leaks? 65 years of changing out gaskets, seals, and rebuilding engines when I should have just changed the oil. :(
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