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SVT Shelby GT500
API SM/SN certified engine oils, and why NOT to use them.
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<blockquote data-quote="UnleashedBeast" data-source="post: 10244036" data-attributes="member: 112023"><p>Yes, AMSOIL top tier and Royal Purple are both still in API SL & SJ territory, except AMSOIL's XL and OE oils are API SM/SN. </p><p></p><p>Ford ONLY recommended 5W-20 due to CAFE laws. They needed to save money from the penalties of producing cars that fell under 28 mpg average. Let's put it like this....would you willingly increase your engine wear for a maximum of 1 mpg improvement? I wouldn't!</p><p></p><p>I still don't believe Ford had intentions of using a 50 weight oil in the Shelby, they just knew their Conoco oil would easily shear from a 50 to a 40 weight.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 10244036, member: 112023"] Yes, AMSOIL top tier and Royal Purple are both still in API SL & SJ territory, except AMSOIL's XL and OE oils are API SM/SN. Ford ONLY recommended 5W-20 due to CAFE laws. They needed to save money from the penalties of producing cars that fell under 28 mpg average. Let's put it like this....would you willingly increase your engine wear for a maximum of 1 mpg improvement? I wouldn't! I still don't believe Ford had intentions of using a 50 weight oil in the Shelby, they just knew their Conoco oil would easily shear from a 50 to a 40 weight. [/QUOTE]
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SVT Shelby GT500
API SM/SN certified engine oils, and why NOT to use them.
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