Northstar Engines and System Technical Discussion Discussion, '99 STS Oil Smell? in Cadillac Engine Discussion; Well on my way home from work tonight I noticed a burning oil smell, but the smell was only appearing ...
Well on my way home from work tonight I noticed a burning oil smell, but the smell was only appearing when the car was on a forward or backward incline. When I got home my dad and I took a quick look at the engine for any signs of leaks, nothing that we can really see for sure. However, we did see below the master cylinder that there seemed to be what looked like a gasket of some sort that obviously had some oil on it. Not sure if this is something that should or should not have oil on it.
Is this a big problem? Where should I start to try and fix this issue? Before I bought this car the Cadillac mechanic I bought it from resealed one half of the oil pan I think he called it? Not quite sure, but could it be the other half of that gasket that's going bad? My dad said he thinks it might be a valve cover, which judging by some responses in this thread I don't doubt his judgment. http://www.cadillacforums.com/forums...oil-smell.html
Oh and despite this minor problem (I am hoping it is only minor) I am loving the car, and driving it like I stole it!
The rear main (or half main, I've heard it referred to both ways -- unless it's 2 different parts, and they both leak...) are to my understanding an annoyance and a slight mess. Hey, if your guy will fix them for free, go for it. The dealer here charges about $2500...
Automobile(s): 2000 Polo Green Metallic Cadillac STS 60K
Re: '99 STS Oil Smell?
Yeah I agree if the guy said he'll fix anything for 6 months take it to the dealer have them look it over and give you a print out of everything the car needs then take it to your guy. Hell why turn down free service!
The best way to pin down an oil leak is to get the car up on a lift, and if you can't readily identify the leak point, thoroughly clean the lower half of the engine with Gunk Foaming Engine Cleaner and a low pressure (pistol grip) hose spray. Stay away from all those wonderful connectors and ignition packs. Just get the crud off the pan and lower block.
Drive around for a couple of days and back up in the air. Things are much easier to find while the car is up in the air - you miss a lot if you have to roll around on the ground, and it sounds as if your mechanic is open for suggestion.......
The common leak points are the oil pan gasket itself, and above that, the half-case seal. (The Northstar has no main bearing caps per se: the entire middle section of the block - the half case - is the bearing caps, girdle, structural member, oil distribution plate retainer, etc. It comes off as an entire unit, so it requires a shaped O-ring type seal.) Others are the engine crankshaft transmission end seal, the cam cover seals, the oil filter adapter O-rings, and possibly a transmission output shaft seal. The only right and proper way to cure a half case seal or oil pan gasket is to remove the engine from the car. Yes, you could put some goop on the outside of the leaky gasket, but that's not a cure, it's a patch.
This is a SWAG (Scientific Wild-Ass Guess).......but if the smell only occurs on an incline, make sure that the metal guard for the exhaust crossover pipe under the transmission/engine joint is not full of oil. If it is, that's either oil pan, half case or rear crankshaft seal(s).
Automobile(s): White Diamond '03 DHS (with DTS floor shift)
Re: '99 STS Oil Smell?
The mechanic did replace half of the oil pan gasket, saying that it was bad but the other half looked good to him. Is it possible the other half went and thats whats causing it?
No such thing as "half of the oil pan gasket". Maybe he meant halfcase. Cam covers are the least likely. More likely one of the things that Sub mentioned. All are something that you can live with if you are willing to put up with a little smoke and oil smell.
I'm guessing the only thing that it will do is cause a bad oil smell sometimes and cause me to go through oil faster than normal? Or will my oil consumption stay the same? Either way, as long as its not something that's going to cause major problems later on I'm a happy camper!