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Cadillac STS Forum - 2005 through 2012 Discussion, People with the 2005+ Northstars: Do you have problems with oil leaks? in Past Cadillac Vehicle Discussion; Originally Posted by EChas3 Bob K can't shake the mis-information that the 2005 & up 4.6 Northstar uses excessive oil. ...
  1. #16
    bob k is offline Cadillac Owners Member
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    Quote Originally Posted by EChas3 View Post
    Bob K can't shake the mis-information that the 2005 & up 4.6 Northstar uses excessive oil. IMHO, there is no real pattern of this, even when abused. Some examples will burn a bit but very few leak. Most engines burn a little, especiall when producing like power & torque.

    It's only real shortcoming is that it only gets average mileage. (It was expensive to build, but that's moot now!)
    I think our definition of excessive oil use is a bit different.

    DSC03411reduced.jpg

    That is what has happened on our 97 Seville, and why we are shaky on getting another one because we wouldn't like to repeat this later. Both have over 200K miles and have absolutely nothing wrong with them, except for this. We drive our cars till the wheels falls apart. Oil consumption im not worried about, its the oil LEAK.

    Our Caddy's get about 22-23 MPG with mix of city and highway driving, so its not too bad. Once however we drove back from Wisconsin and had filled up with Ethanol-free fuel, and we damn near got average 30 MPG on the way back. It was amazing what proper fuel would do. Too bad were in Illinois....

  2. #17
    oldcaddybuyer's Avatar
    oldcaddybuyer is offline Cadillac Owners Fanatic
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    Get a N* while you still can. I'm still searching for a low mileage N*...

    I sure hope the new STS...I mean CTS...has something to offer other than the 3.6DI. We are not enthused.

  3. #18
    jsiddall is offline Cadillac Owners Fanatic
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    Quote Originally Posted by oldcaddybuyer View Post
    Get a N* while you still can. I'm still searching for a low mileage N*...

    I sure hope the new STS...I mean CTS...has something to offer other than the 3.6DI. We are not enthused.
    Something like twin turbo, say with 420 HP?

  4. #19
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    Quote Originally Posted by oldcaddybuyer View Post
    Get a N* while you still can. I'm still searching for a low mileage N*...

    I sure hope the new STS...I mean CTS...has something to offer other than the 3.6DI. We are not enthused.
    Just slap a supercharged vette motor in there again...Seems to work well with the current CTS-V
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
    2001 Seville Touring Sedan - 2006-2011
    1995 Seville Touring Sedan - 2005-2006

  5. #20
    my_bro is offline Cadillac Owners Member
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    I'm leaking at 115K. Can't exactly see where but think it's the case half in the rear. It leaves a little puddle.

  6. #21
    chazglenn3's Avatar
    chazglenn3 is offline Cadillac Owners Connoisseur
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    I'm coming up on 127K miles and no oil leaks or excessive burning so far. Big contrast to my previous generation STS's.

  7. #22
    edoubble2082 is offline Cadillac Owners Member
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    My sts4 v8 1 sg leaks at 130k I know this isn't that common but it happens I bought mine because I thought the leaking/Hg problem was fixed after 05 (i have a couple threads right now regarding this )just somthing to think about good luck

  8. #23
    johng99 is offline Cadillac Owners Member
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    Love my new (to me) N* STS - 2005 purchased with 21,000 original miles. I have driven it about 3.000 miles in the last month, and am really glad I bought this car while examples like this are still out there. Oil leaks, well I drove Mercedes Benzes for many years, and head gaskets were pretty routine on the inline 6's and not uncommon on the V8's especially when approaching 200,000 miles. I hope I don't have oil leak issues again, but I wouldn't be frustrated with small leaks after my MB issues, and even if I have to replace seals or gaskets, the costs are pretty low compared to doing these jobs on the premier german cars. So get that Cadillac, drive it hard and enjoy it, knowing you have just bought one of the great performance/luxury values out there.
    Charles Warren likes this.

  9. #24
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    I recently had my engine serviced because of the case half seal. The shop tells me it's about 16 hours labour (I have an AWD so there is a little more time in mine) plus parts. Fortunately I had GMPP warranty that covered all but $100. Personally, I wouldn't shy away from the N* just for this reason. I love my car (except in the city the fuel economy is dreadful) and would not worry too much about a minor leak. As long as it's not a big leak, the cost of 16 hours labour can buy a lot of oil! Even when I had the leak, my oil consumption was minimal. I don't ever recall adding between oil changes, despite using the OLM which means longer intervals.

    I have no interest in the 6 cylinder at all. My mother has one in her Enclave and I'm really not impressed. It's very low mileage and has already been in for some of the common items (including timing chain).

  10. #25
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    There's not enough torque in a 3.6 V6 to launch more than 2-tons to 80 MPH like we want. What good is top end (i.e. HP) in the states, anyway.

  11. #26
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    achavez is offline Cadillac Owners Member
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    05 N* w/86k miles. owned it for about 2 months now. no leaks. I have been under the car as well and all is dry and healthy so far

  12. #27
    Charles Warren's Avatar
    Charles Warren is offline Cadillac Owners Fanatic
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    140k+ no leaks. Replaced valve covers because I thought I had a leak turned out to be oil filter loose (somebody had to loosen it) but nice and dry. Diff has some hairy looking stuff but looks normal but I cleaned it off to see if it'll come back. Will update next oil change

  13. #28
    Lifer's Avatar
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    Quote Originally Posted by dkozloski View Post
    My '06 Northstar with 55K miles doesn't leak a drop.
    My hard driven '06 with 85K is flawless. I get 22 MPG (under 80 MPH) and it is FAST.

  14. #29
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    109k here, no oil leaks or real usage issues at all, last oil change interval I think I added a 1/2 quart over like 10k...My two previous Northstars (95, 01) leaked a good bit, the 95 burned it up pretty good too. AVG'ing 20-21MPG per tank since I got her at 71k. Easily the best Northstar I've owned to date
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
    2001 Seville Touring Sedan - 2006-2011
    1995 Seville Touring Sedan - 2005-2006

  15. #30
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: People with the 2005+ Northstars: Do you have problems with oil leaks?

    My wife's has over 75k and mine has over 85k and the garage floor is clean & dry. Only rarely, after very spirited driving, does my oil level drop at all. Hers needs a bit every few months.

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