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Exxon Mobil Corporation Message Board

  • food_stamp_nation food_stamp_nation Oct 6, 2013 2:14 PM Flag

    Octane VS engine block and air temperture

    I was hoping someone who understands octane could answer the below question for me.

    During the winter when the air is cold and you engine block is not up to full running temperature yet,
    does your 91 engine need the full octane? Since the engine block is still heating up ( less than 10 miles) do
    you really need the 91 octane? Also, If you are running a car down the highway @ 80MPH @
    15 degrees F do you need 91?

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