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SVT Shelby GT500
5w50 mobil 1- good or bad
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<blockquote data-quote="6-Speed" data-source="post: 10876612" data-attributes="member: 65111"><p>Beast do you have a plot of oil pressure vs. RPM with the 10W40 yet? Would be good to see a comparison with 10W30, once you start using it in the Shelby. </p><p></p><p>It will be awhile before I'm ready to dump the M1 5W50 ... perhaps in the Winter. IMO M1 5W50 has a good additive pack with a bit more ZDDP (1000 ppm P and 1100 ppm Zn) than other API certified oils, and with a good dose of Boron and Moly for additional anti-wear/friction modifier protection. The virgin TBN is pretty high and it has ACEA A3/B3 and A3/B4 European oil certs for high performance cars, which must pass more stringent tests than oils meeting only API specs ... but we'll have to see what the UOA looks like. I fully expect it to shear to a 40 grade, but no more.</p><p></p><p>I am also considering a lower 40 grade oil too, but will wait until the power-train warranty expires next July. Thought M1 0W40 might be a good candidate, but I see it is a very light 40 grade and with a high viscosity index would be prone to shearing. Its virgin HTHS viscosity is 3.8 cSt, which barely exceeds the 3.7 cSt minimum required by the Ford B-spec for 5W50.</p></blockquote><p></p>
[QUOTE="6-Speed, post: 10876612, member: 65111"] Beast do you have a plot of oil pressure vs. RPM with the 10W40 yet? Would be good to see a comparison with 10W30, once you start using it in the Shelby. It will be awhile before I'm ready to dump the M1 5W50 ... perhaps in the Winter. IMO M1 5W50 has a good additive pack with a bit more ZDDP (1000 ppm P and 1100 ppm Zn) than other API certified oils, and with a good dose of Boron and Moly for additional anti-wear/friction modifier protection. The virgin TBN is pretty high and it has ACEA A3/B3 and A3/B4 European oil certs for high performance cars, which must pass more stringent tests than oils meeting only API specs ... but we'll have to see what the UOA looks like. I fully expect it to shear to a 40 grade, but no more. I am also considering a lower 40 grade oil too, but will wait until the power-train warranty expires next July. Thought M1 0W40 might be a good candidate, but I see it is a very light 40 grade and with a high viscosity index would be prone to shearing. Its virgin HTHS viscosity is 3.8 cSt, which barely exceeds the 3.7 cSt minimum required by the Ford B-spec for 5W50. [/QUOTE]
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