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5w-20?

This is a discussion on 5w-20? within the General Help forums, part of the LSx Technical Help Section category; so i got my oil changed today at a new place and the guy insisted that i go with 5w-20 ...

  1. #1
    Don't Listen to Me NE98LS1's Avatar
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    5w-20?

    so i got my oil changed today at a new place and the guy insisted that i go with 5w-20 (i use a synthetic blend, i feel its a good compromise since i don't have the $$$ for the all out synthetic!) before i'd always used either 5 or 10 w-30...is this guy crazy?

  2. #2
    no more 4th gen secondgearscratch's Avatar
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    Quote Originally Posted by NE98LS1 View Post
    so i got my oil changed today at a new place and the guy insisted that i go with 5w-20 (i use a synthetic blend, i feel its a good compromise since i don't have the $$$ for the all out synthetic!) before i'd always used either 5 or 10 w-30...is this guy crazy?
    yep he's crazy.

    10w30 ftw.

    or 5w30 if anything...

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    Member BADBLUE02's Avatar
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    Crazy is a good description. 20 weight is too thin for these motors.

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    Grand Imperial Wizard Sarge's Avatar
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    Too thin and not recommended by GM. 5-30 or 10-30. Have it changed ASAP.

  5. #5
    Retired NOT tired SteveC's Avatar
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    5W-20 is used mostly in Ford and Honda products, the Honda for the close tolerances in the engine, Ford for meeting the MPG average mandated by the Federal Government, the thinner oil has less friction, so better gas milage.

    5W-20 should not be used in the LS1 motor.

    SteveC

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