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    Gilbertd's Avatar
    Gilbertd Posts: 1, Reputation: 1
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    #1

    May 10, 2010, 12:06 PM
    Would it be better to use synthetic oil in my 2004 F250 6.0 diesel.
    Would it be better to use synthetic oil in my 2004 F250 6.0 diesel? If so should I use 5W40 or 15W40?
    Thank you
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    May 10, 2010, 12:13 PM

    You absolutely want to use full-synthetic heavy duty diesel engine oil (HDDO) in your truck, especially if it has a turbo. I would lean towards SAE 5W-40 for slightly better mileage.

    These links may help:

    https://www.askmehelpdesk.com/cars-t...ml#post1415281

    https://www.askmehelpdesk.com/cars-t...ml#post2162069
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