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Thread: Z20LET Oil - Fully or Semi?

  
  1. #1
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    MattyBoomBoom's Avatar
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    Z20LET Oil - Fully or Semi?

    Hi,

    Got all the parts to service my Coupe Turbo. Just forgot what oil I need and after trying to search, I got even more confused.

    Engine was rebuilt 14k miles ago. Z20LET running 240bhp.

    I know I need 10w/40 grade Oil. Does it matter if it's Fully Synthetic, Semi-Synthetic or whatever?

    Castrol 10/40 is on offer at my local shop, but doesn't say if it's Fully Synthetic or Semi-Synthetic? So not sure what it is?

    Oils are confusing for my little head.

    Thanks.
    Astra Coupe Turbo - Loving the Boost!

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    inmyvain's Avatar
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    ive got a semi on......lol
    most use semi but think its ok to use fully....fully is more expensive tho

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    Windrew's Avatar
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    just use the nice stuff fron vauxhalls, it was ment for that engine after all, and thats all i use
    ARDEN BLUE GSI

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    i always used semi, change every 3k cause its so cheap via trade club

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    davemk4coupe's Avatar
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    Who said you need 10W40?
    2006 Astra 1.9CDTi SRi

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    welsh-andy's Avatar
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    Quote Originally Posted by davemk4coupe View Post
    Who said you need 10W40?
    thats what oil is recommended for the zlet by vaux, although some steelers put 5w/30 in, which as nost know is too thin 4 the zlet turbo

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    davemk4coupe's Avatar
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    Ah I see. I asked because my coupe has been running 5W40 for some reason, seems ok though.
    2006 Astra 1.9CDTi SRi

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