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Thread: Mobil 1 5w50 for high mileage V6CDTi - yes or no?

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    Regular Member Celes's Avatar
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    Default Mobil 1 5w50 for high mileage V6CDTi - yes or no?

    Hello there!
    Just ordered 8L of Mobil 1 5w50 Rally Formula oil

    I currently have GM LL 5w30 in but I find the engine louder (when warmed up it's clapping a bit) than with 10w40 oil.

    Your thoughts on the 5w50 oil?

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    Regular Member mattv6diesel's Avatar
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    should be ok the dealer i use, uses 5w30. So slightly thicker but should be ok. Does your book list oil grades

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    Regular Member Celes's Avatar
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    Doesn't mention 5w50, but the Mobil 1 5w50 meets Vx specs for oils.

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    Regular Member mattv6diesel's Avatar
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    should be fine then

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    Regular Member Celes's Avatar
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    Regular Member m8internet's Avatar
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    5W50 is not API or ACEA compliant

    Compare the specifications between 5w30 and 5w50

    http://www.mobil.com/Canada-English/...il_1_5W-30.asp

    http://www.mobil.com/Australia-Engli...bil1_5W-50.asp

    5W50 is vastly thicker, as can be seen by the CST and higher viscosity rating
    Personally I wouldn't use it

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    Regular Member Celes's Avatar
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    Meets or exceeds ACEA A3/B3, API SM/SL/SJ/CF...hmm

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    What about the latest GM-LL-A025 and GM-LL-B025 specs? They're what I always check for on any oil that I buy.

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    Regular Member Jezzy's Avatar
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    Quote Originally Posted by James24 View Post
    What about the latest GM-LL-A025 and GM-LL-B025 specs? They're what I always check for on any oil that I buy.
    If you have the correct viscosity, Mobil1 exceeds the GM-LL-A/B025 standards.

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    Quote Originally Posted by Jezzy View Post
    If you have the correct viscosity, Mobil1 exceeds the GM-LL-A/B025 standards.
    I guess that's why the Mobil1 5w50 doesn't appear to have GM-LL-A025 or GM-LL-B025 approval on it.

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