2008 STS4 V6 Using Oil
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Cadillac STS Forum - 2005 through 2012 Discussion, 2008 STS4 V6 Using Oil in Past Cadillac Vehicle Discussion; I'm getting worried about my STS4. I have the 3.6 and I do about 85% of highway driving. I go ...
  1. #1
    salvie is offline Cadillac Owners Member
    Automobile(s): 2008 STS 4
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    2008 STS4 V6 Using Oil

    I'm getting worried about my STS4. I have the 3.6 and I do about 85% of highway driving. I go between 5-7K miles before changes. I've noticed it's been losing oil...the other day I went to check it because it was getting close to changing it. The dip stick had NO OIL ON IT! I panicked! No oil drips on the garage floor...nothing leaking. Any ideas? Oh, and i dont want to hear about the oil life indicator on the DIC. It's telling me I have 40% oil life. It's on 7000 miles since the last change and nothing is on the dip stick and I have 40% life left...what a joke!

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  3. #2
    1BadCadSTS's Avatar
    1BadCadSTS is online now Cadillac Owners Connoisseur
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    Oil LIFE has nothing to do with oil LOSS. 3.6 oil consumption is a common problem and is well documented. Running it low and long duration between changes (like paying attention to the olm) increase the problem. Install a catch can change to 3-5k mile oil changes and monitor it. Nothing you can do unless you want to tear it down install new valve guides and re-ring and hone the block.

    As the saying goes... Coulda had a V8...
    Ludacrisvp likes this.

  4. #3
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: 2008 STS4 V6 Using Oil

    There is a modification you can make to the PCV system as well as adding a catch can. There is tons of info about this in the 1st gen CTS forum as it is a VERY common problem with the 3.6L engines.

    When I owned my '04 CTS 3.6L I religiously changed the oil every 5k and kept up on the oil level but it still developed timing chain slack, hence the move to the V8 STS...
    Past Cadillac's

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  5. #4
    SC2150's Avatar
    SC2150 is offline Cadillac Owners Connoisseur
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    Re: 2008 STS4 V6 Using Oil

    Good info in the 2 posts above. There is several things going on causing this, and some may improve after installing the catchcan (and not just any one, only a few catch all, or nearly all the oil....most still let a good deal pass through) and doing a good upper induction cleaning.

    But a result of the oil ingestion via the intake air charge is the deposits/gumming of the ringlands. This causes the rings to stick and not move freely allowing more oil to be sucked past the rings from the crankcase during the intake stroke. After installing a good can (we manufacture the RX can) and doing an upper induction cleaning, usually these deposits will clean up some and allow the rings to seal properly again.

    If you need more details, feel free to PM me.

    www.RevXtreme.com
    RX Performance Products/RevXtreme.com 941-721-1826

  6. #5
    carter's_sts is offline Cadillac Owners Connoisseur
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    I thought it was the older (pre-DI) 3.6s that could have oil issues. Same with the newer ones?

  7. #6
    1BadCadSTS's Avatar
    1BadCadSTS is online now Cadillac Owners Connoisseur
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    Quote Originally Posted by carter's_sts
    i thought it was the older (pre-di) 3.6s that could have oil issues. Same with the newer ones?
    any 3.6

  8. #7
    SC2150's Avatar
    SC2150 is offline Cadillac Owners Connoisseur
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    Re: 2008 STS4 V6 Using Oil

    All modern DI engines from most any manufacturer are having issues, the LLT that you have is very common for consumption issues, but not alone. V8's if broken in easy will as well.
    RX Performance Products/RevXtreme.com 941-721-1826

  9. #8
    carter's_sts is offline Cadillac Owners Connoisseur
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    Re: 2008 STS4 V6 Using Oil

    Could you explain more? Is there something about DI engines that make them more susceptible to oil consumption?

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