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Mix 'high mileage Mobil 1' with regular mobil 1, both fully synthetic

Discussion in 'Technical Chat' started by STLTaco09, Jun 4, 2010.

  1. Jun 4, 2010 at 5:03 AM
    #1
    STLTaco09

    STLTaco09 [OP] Well-Known Member

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    5100's all around, fronts at 1.75". TSB leaf pack + Toytec TSB AAL
    As the title says, can I mix the fully synthetic high mileage mobil 1 with the regular fully synthetic mobil 1? The Walmart by me never has the regular 5W-30 fully synthetic mobil1 5 quart jug, but they have the stuff labeled "High Mileage" fully synthetic (says for cars with high mileage). My Tacoma only has 20,000 miles on it, but I've been using synthetic since 1200 miles.

    Any Pros/Cons to use the stuff labeled "high mileage" in a low mileage vehicle?
     
  2. Jun 4, 2010 at 5:04 AM
    #2
    STLTaco09

    STLTaco09 [OP] Well-Known Member

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    5100's all around, fronts at 1.75". TSB leaf pack + Toytec TSB AAL
  3. Jun 4, 2010 at 5:06 AM
    #3
    Toyota Truck

    Toyota Truck Well-Known Member

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    I don't think it's a big deal as long as there the same weight.
     
  4. Jun 4, 2010 at 5:11 AM
    #4
    Jimmyjohn

    Jimmyjohn Well-Known Member

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    I don't believe in mixing any oil.
     
  5. Jun 4, 2010 at 5:19 AM
    #5
    Janster

    Janster Old & Forgetful

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    Get on Mobile 1's website and send them an e-mail. They are pretty quick to respond.

    Ask them....

    "Is the high mileage / truck & SUV oil the same as the standard oil?"

    "What's the difference between Mobile 1 5W-30 and the high mileage 5W-30?

    I recently e-mailed them about their gear oil. I asked them if the Mobile 1 75W-90 LS (gear oil) was the same as the 75W-90 (without the LS). And YES - it is the same oil. It's marketing....

    I'm halfway tempted to bet, it's the exact same oil.
     
  6. Jun 4, 2010 at 5:23 AM
    #6
    JDMcQ

    JDMcQ Well-Known Member

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    It won't hurt anything to mix the oils, one can even mix synthetic with non-synthetic.
     
  7. Jun 4, 2010 at 5:54 AM
    #7
    gupster88

    gupster88 Well-Known Member

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    Sorry to jack your thread OP...so would you still need additive if you use the 75-90LS gear oil? The guy told me i didnt because its already in the oil for LSD gears.
     
  8. Jun 4, 2010 at 6:18 AM
    #8
    STLTaco09

    STLTaco09 [OP] Well-Known Member

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    5100's all around, fronts at 1.75". TSB leaf pack + Toytec TSB AAL
    Good idea, I shot them an email. Thanks for the input.
     
  9. Jun 4, 2010 at 6:24 AM
    #9
    Janster

    Janster Old & Forgetful

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    You might want to look at this thread:
    http://www.tacomaworld.com/forum/2nd-gen-tacomas/93117-beware-changing-lsd-lube.html

    The LSD's in these trucks tends to be 'picky' and there are lots of conflicting information of what works & what doesn't work in terms of oils/additives.
     
  10. Jun 4, 2010 at 8:10 AM
    #10
    STLTaco09

    STLTaco09 [OP] Well-Known Member

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    5100's all around, fronts at 1.75". TSB leaf pack + Toytec TSB AAL
    So I got an email response asking to call their 1800 number. I called, they told me the high mileage stuff have extra additives to help cleaning the engine, and it is on the thicker side of the viscosity curve to help prevent burning extra oil. I asked if I could use it in a low mileage vehicle, he said as long as I am not under warranty, I could use it. I asked why that had any impact, he said that vehicles require a high efficient (I think thats what he said?) oil, and this oil did not meet those standards. So since I'm under warranty still, he said I should not use it.

    Interesting...

    They did say it could be mixed though with the regular 5w-30 stuff.
     
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