How To Fix Northstar Engine Oil Leak

clumsy12

I have 08 Lucerne CXS with northstar V8 - Did an oil alter recently and there was oil everywhere under the engine - did not accept to add any oil since last alter - took it to GM dealer ( yet under warranty ) they added dye to engine oil, when I came back they said they take ordered parts ( gaskets ) and would replace them ( did not say anything nearly caput gasket bolts as of yet. Is this mutual and should I be OK once these repairs are done - warranty is at present expired. I practise non desire the engine to be compromised for the futurity or should I trade information technology afterward the repairs are done???

92sub

yep...Northstars leak oil.

From the lesser up, you have an oil pan, an oil 'manifold' so the lower crankcase.
Mutual leak point is the manifold to pan and/or manifold to lower crankcase gaskets.
Unless they did something unique for Lucerne the engine or trans has to come up out in gild to replace.
Most likely it only leaks while running every bit it is a 'pressure level' leak.
New gaskets and maybe a new oil manifold will stop your leak but can't say it will never leak once more.

Texas Jim

I have a 2006 Caddy with the Northstar...
Mine also leaked... they replaced the example half-seal and the rear valve embrace gasket about 35,000 miles agone.

No issues since so

Jim

go_phx

X3^

Our 2006 CXS started leaking inexplicably last autumn (with 40k on the ODO). Dealer replaces a BUNCH of engine and trans gastets (the already mentioned example half seal, etc). Had to be $2k worth of parts / labor. Fortunately extended warranty covered it all.

polarzak

I take heard so many bad things, mostly oil leaking, about the NorthStar. When looking for my new Lucerne, I institute 1 and fell instantly in honey with it. It had everything, color, amenities, AND a V8. I wanted a V8. The delaer let me have a demo out, and it was powerful and smooth. I went back and popped the hood on what was to exist my new car and found it was a NorthStar V8. I sadly walked away. Somewhen I found some other perfect Lucerne, with the iii.8 six. I bought it. Nosotros had a 3.eight in our 2000 LeSabra and never put a dime in information technology, didn't leak oil, and had over 250k miles on it at trade. I am lamentable for your problems. It is a known problem so fight with GM if you have to, and hopefully they volition repair it out of warranty, or at least split the cost. No idea if their fix will terminal or not. Expert luck.

berg0449

I had my 2006 cxs in the shop overnight. They found an oil leak that I was not aware of. I am not sure the parts they replaced but it took a rebuild of the engine. It was covered by my extended warranty, simply they were billed about $4000. Information technology took 2 days at the shop to fix, just also had to sit for an additional 6 days for the warranty to verify they would cover information technology.

All that for trying to solve a air bag light that came on so information technology sat overnight. In the end the air bad light went off on it own. But at least that got my oil leak stock-still before my warranty ends.

THis is probaby meliorate than my 2000 LaSabre engine that was destroyed by the plenam that went out. That put all my antifreeze in my oil while the car was running. I know that my warrenty on that likewise stock-still it, but the engine was never the aforementioned. The engine basically needed replacing. After having three V6 Lasabre that I know with the same problem it make me automatically get to the V8.

clumsy12

Thank you for all the advice - I volition become the car back this week - we'll meet what happens thank you again

Texas Jim

Mine does non leak, but even if information technology did, I call back I would tolerate the oil leak for the ability of the V8.

Texas Jim

clumsy12

Got the automobile back from GM today - they RESEALED LOWER CRANK CASE FOR LEAK - RESEALED REAR MAIN SEAL AND VALVE COVERS
Parts list is 12 gaskets i seal 1 cover i manifold ( gasket I guess )
Cheers for all your help - hope the repair lasts - was repaired with 0 accuse to me

Texas Jim

Got the motorcar back from GM today - they RESEALED LOWER Crank Case FOR LEAK - RESEALED REAR Chief SEAL AND VALVE COVERS
Parts list is 12 gaskets 1 seal 1 cover 1 manifold ( gasket I guess )
Thank you for all your assist - hope the repair lasts - was repaired with 0 accuse to me

Very practiced....
That's about the same thing that was done to mine...
It has been good for the last xxx,000 miles...

Texas Jim

07buicklucerne

I have a 07 buick lucerne CXS..... having all sorts of issues with information technology. 1 of which is this oil leak. I wasn't having this result until I took it in for an oil change at the stealership. That day I noticed an oil leak from near where the oil filter is (front right paw side (front passangerside for the rookies)). I brought in to come across if they forgot to tighten the filter and the service writer came out and told me I had a huge leak. Nosotros got in the back to look at my automobile while it was on the lift. He showed me a leak which we couldn't determine the exact location of it. Crank seal and the oil pan gasket were pretty much our but options. I know they won't cover it considering of the manufactures date..... did I mention "stealership" lol. I bought the oil pan gasket and am looking into seeing if I accept to drib the whole subframe to get to this gasket. Lemme know what'southward ya think....?

vintage42

I accept a 07 buick lucerne CXS... oil leak. I wasn't having this issue until I took information technology in for an oil change at the stealership... Creepo seal and the oil pan gasket were pretty much our but options. I know they won't comprehend information technology because of the manufactures date... Lemme know what's ya think....?

Stealership sounds like you lot are critical of the dealership.
Is that considering the dealer should have repaired the leak considering they apparently caused it during the oil change? Or that dealer should have repaired it because the car is non long past its warranty?

92sub

I bought the oil pan gasket and am looking into seeing if I have to drop the whole subframe to get to this gasket. Lemme know what's ya think....?[/QUOTE said:

You lot have to drop the transmission to piece of work on the oil pan. The pan is trapped by the exhaust pipe which in plow is trapped past the transmission. Not sure where you bought a gasket for it since GM does not make 1. The Northstar engine requires a very specialized silicone developed just for this application. If your going to practise the repair I propose y'all return your aftermarket gasket and become the sealent.
.....and the dealer did not cause your oil leak. These engines leak under pressure which ways unless you idle in one spot for long periods your not going to get staining/puddles commonly associated with oil leaks. Instance in signal: I have a 99 Aurora (Nstar engine) which has leaked oil for over five years. Information technology'due south parked in the same spot in the driveway every twenty-four hour period and in that location's never a drop on the ground. Yous elevator the car in the air and the unabridged lesser of the engine is covered in oil. So y'all can go a long time with a 'substantial' leak and non really know it.

I more thing, your probably going to need an oil manifold supplant and perhaps a lower crankcase reseal likewise.
Fixing Northstar oil leaks is a very extensive job and it's something y'all only want to do once then I'd leave this one to the pros.......either live with the leak or drop the large money.

Texas Jim

I have a 07 buick lucerne CXS..... having all sorts of issues with it. One of which is this oil leak. I wasn't having this issue until I took it in for an oil modify at the stealership. That day I noticed an oil leak from about where the oil filter is (front right hand side (front passangerside for the rookies)). I brought in to run across if they forgot to tighten the filter and the service author came out and told me I had a huge leak. We got in the back to look at my motorcar while it was on the lift. He showed me a leak which we couldn't determine the verbal location of it. Creepo seal and the oil pan gasket were pretty much our only options. I know they won't comprehend it considering of the manufactures date..... did I mention "stealership" lol. I bought the oil pan gasket and am looking into seeing if I accept to drop the whole subframe to go to this gasket. Lemme know what'south ya think....?

If you did not have a bad leak earlier the oil was changed...it is very unlikely that a actually bad leak started from the pan gasket at the exact same time that the oil was changed.

It is much more likely that the oil force per unit area sending unit ... which is correct above the oil filter, is leaking.

On older Northstars, the oil force per unit area sending unit was a fairly common leak.

It is also unlikely that the oil pan gasket is leaking.
If the leak is in THAT area... it is much more likely to be the example half seal.

If I am not badly mistaken, both the oil pan gasket replacement and the example half seal require the removal of the engine to repair properly.

Texas Jim

92sub

If I am not badly mistaken, both the oil pan gasket replacement and the instance half seal require the removal of the engine to repair properly.
Texas Jim

Either the engine or transmission has to come out. Since Northstar engines don't really come out the summit you have to drop the whole powertrain (eng/trans/struts/wheels) to the flooring and and so lift the engine off the cradle assembly to 'pull the engine'. Or yous can go out about of the Powertrain intact and just remove the trans. Each tech has his preferred method and either 1 will allow admission to the pan/oil manifold/case part line seal/etc.
On every Nstar I've seen with a leak it's been oil pan to manifold, manifold to lower case and so a few with lower case to block. The newer sending units don't seem to leak equally much and it'south very credible when they exercise so when it was on the hoist they should accept been able to pinpoint a leak there right abroad.

Schubie

Bought an'06 Lucerne with 20k miles with the Northstar. Two mechanics take told me to sell it. Dear the auto though. Thoughts? Is the notorious leaking usually after a sure mileage?

bigsky

I'll give this a shot based solely on what I have read. Occasionally there is a report of 1 leaking early maybe twoscore-50k miles. Some have went to 125k+ with no leaks. Some people have had leaks and just lived with them. Some mechanics have no utilise for Northstars. Repairing leaks can be expensive and/or labor intensive.

Forums seek to assist those who are having an result or problem. I take no idea what the leaking rate is when considered every bit a whole. I would probably just enjoy the automobile if yous like it.

clumsy12

Got the car back from GM today - they RESEALED LOWER CRANK Case FOR LEAK - RESEALED REAR MAIN SEAL AND VALVE COVERS
Parts list is 12 gaskets 1 seal i cover i manifold ( gasket I approximate )
Thank you for all your assist - hope the repair lasts - was repaired with 0 charge to me

My 08 CXS V8 had the Exact same piece of work washed to it. Same wording, same number of gaskets, was done at 49k in Apr 2012. Now has 59k ( wife'due south car, does not drive much, mostly local ). It has now been leaking again for most 6 months, smell burnt oil when I drive information technology. Mine was also done under warranty. I asked what was done when I picked it up - just wanted to tell me it was fixed. Was guaranteed for 1 twelvemonth / 12k, just problem resurfaced afterwards that. Don't know what to do now???

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