well some people say yes and i say no, i've just changed over and i love it. the only thing i recommend is not to change oil weights, stay the same. i've notice that synthetic has mad my engine run way more smothly....its a plus man...
I actually went to 10W30 from 5W30 when I switched to Mobil1 a year ago. There's just something about using 5W30 in the hot weather down here that worries me.
Mobil 1 syn is what the Mountaineer is addicted to.
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