Hey guys! I just stepped up from an amazing 04 Comp Orange Vert Cobra to an even more amazing 13 Shelby. Anyways, she's got some mods and plan on getting cams done in the next month or so. I need an oil change and was thinking based on some quick internet research and looking through a couple threads by unleashedbeast about previous years GT500's it seems that Amsoil 10w-40 is a good choice for these cars, is that correct. Would like to order it today but want to cross check with everyone here on SVTP first. I have mainly ran Royal Purple HPS in all 4.6 Cobras I've had with no issues. Does the zinc content match up with Amsoil or do they have a better version similar to Royal Purple's lineup? Would like something with better protection quality than the motorcraft 5w-50 that seems to be recommended by Ford. Thanks for any and all help guys! Oh, and here she is...
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