regular or premium

  1. U

    New to me 2019 Navi fuel grade question- 87 or 93

    Just bought my Navi and my grandpa condition is as kiddos to ONLY put premium in the tank of his Lincoln. 😀 That said, I get the logic. You just paid a lot of $$$ on a car, give her the best tools to reach peak performance. Only 1 previous owner and she only used 87 octane. Can I switch to...
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