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Thread: Engine oil??

  1. 06-01-2013, 03:38 PM #1
    2005 F150 KR
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    Engine oil??

    Ok I just purchased oil gor my 2005 F150 and notice that I purchased 15W-40 as I was poring it in my truck. ... now I am wondering if this will hurt my truck? I meant to grap the 5W-20, lol
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  2. 06-01-2013, 03:52 PM #2
    pockets
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    If your truck had 5w-20 in it already and you poured 15w-40 it could cause problems so you would need to drain your oil out and put oil of the same velocity in it. And make sure you don't ever mix synthetic with regular oil.
    Last edited by pockets; 06-01-2013 at 04:39 PM.
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  3. 06-01-2013, 06:03 PM #3
    Raptor05121
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    Not at all. It will just change the viscosity. They are all made to API service SN specifications; and (despite the labels and price) most come from the same factory.

    If you mixed one quart of 15W-40 with one quart of 5W-20, just do the math: You now have 2 quarts of 18W-30.

    And you absolutely can mix conventional and synthetic. Ever hear of Synthetic Blend? (Hint: Motorcraft offers it on the shelf, and is what I use)
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  4. 06-01-2013, 07:39 PM #4
    pockets
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    Well you use to not be able too. Apparently oil is more modernized so my bad

    ----------

    Excuse me for being wrong
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  5. 06-01-2013, 08:02 PM #5
    5.0Flareside
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    Don't pour 15-40.. Just go buy the correct spec oil.. 15-40 causes issues in the 5.4's top ends..


    Seen many that way


    Sent from my iPhone 4 using Ford Power

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    Also it's perfectly fine to switch back and forth between synthetic and conventional.. No problem.. Can also mix them.. Oil has came a long way.

    I could post more details.. But strictly not allowed due to agreement for while I work at valvoline


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  6. 06-01-2013, 08:44 PM #6
    pockets
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    Synthetic blend has a ruber inhibitor.
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  7. 06-02-2013, 02:42 PM #7
    2005 F150 KR
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    Thanks you for all the help, ATW!!
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