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I have seen ugly oil on cars that we have built and get moved around the shop often over a long period of time. This is almost certainly a result of not reaching operating temperature. Depending on driving distance and weather condition some cars seem to require oil changes every 2k miles. Coyote Mustangs will have fuel pump failure if you don't put a fuel lubricant in the tank. Some have even reported high pressure pump and injector failure. If a Ford dealer is made aware of E85 use they will void all fuel system related warrenty claims.
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