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  1. #1

    Join Date
    Jun 2010
    Columbus Ohio

    Will a little synthetic mix with fossil

    I want to change the oil in a 4-tec that I bought used. I have no idea what kind of oil is in the crank. I don't know if the two different oils will mix together if my 50% guess is wrong. My understanding from this forum is that I will never get all of the oil out so there will be some residue left in the motor. Any words of wisdom or experience will be greatly appreciated.

  2. #2
    If your not 100% then use semi-synthetic oil. It can be used with either oil, but you are cannot mix full synthetic with conventional oil.

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