[Monster900]

Hey Guys,

Tried to search the forum but couldn't find much about this. Recently I have installed Cobb AP Stage 1 Sport map and after driving the car for two days I have noticed burning oil smell in the cabin and smoke from under the hood. Today I came back from work and noticed oil paddle on the garage floor after car being parked overnight. I did check it underneath and engine tray is oily so it means that oil is dripping on the tray and then on the floor. Just to clarify there were no leaks before installing the tune and I just drove the car with the tune for two days only and wasn't pushing it hard at all. Is the increase in boost (stock boost on our cars is ~8 psi and Stage 1 Sport is ~11 psi per Cobb) is pushing oil out through one or more of the seals and if so which one. I am replacing valve cover this weekend so I will check things out but it is strange that no one else has experienced this issue when on performance tune.

Update: After replacing VC oil leak is complitly gone. Now I am working on small coolant leak on the drv side.

[Dmacc]

Check your oil filter housing gasket as well just in case.

[BMWM.D.]

I'd honestly say it's probably a coincidence. Have you maybe been driving the car a little harder since installing the tune? I can't think of much else tune-related that would cause an oil leak. Now you just need to figure out where it's coming from.

[Monster900]

Originally Posted by Dmacc

Check your oil filter housing gasket as well just in case.

It was replaced 6k miles ago.

[Monster900]

Originally Posted by BMWM.D.

I'd honestly say it's probably a coincidence. Have you maybe been driving the car a little harder since installing the tune? I can't think of much else tune-related that would cause an oil leak. Now you just need to figure out where it's coming from.

Not really and the leak is significant. This would be too much coincident I think.

[Monster900]

Bump

[TT-Tom]

Originally Posted by Monster900

Hey Guys,

Tried to search the forum but couldn't find much about this. Recently I have installed Cobb AP Stage 1 Sport map and after driving the car for two days I have noticed burning oil smell in the cabin and smoke from under the hood. Today I came back from work and noticed oil paddle on the garage floor after car being parked overnight. I did check it underneath and engine tray is oily so it means that oil is dripping on the tray and then on the floor. Just to clarify there were no leaks before installing the tune and I just drove the car with the tune for two days only and wasn't pushing it hard at all. Is the increase in boost (stock boost on our cars is ~8 psi and Stage 1 Sport is ~11 psi per Cobb) is pushing oil out through one or more of the seals and if so which one. I am replacing valve cover this weekend so I will check things out but it is strange that no one else has experienced this issue when on performance tune.

An oil leak stemming from "more boost" is rare. One, if not the only thing, that could happen is failed pcv and allowing boost to enter the crankcase. This will push oil out the path of least resistance, usually the oil cap or filter housing gasket. This will happen stock and with more boost if your pcv is in fact bad. That's where I would start.

[Monster900]

Originally Posted by TT-Tom

An oil leak stemming from "more boost" is rare. One, if not the only thing, that could happen is failed pcv and allowing boost to enter the crankcase. This will push oil out the path of least resistance, usually the oil cap or filter housing gasket. This will happen stock and with more boost if your pcv is in fact bad. That's where I would start.

Front of the engine is clean. The leak is definetly in the back pass side of the engine.

[MDORPHN]

Maybe your valve cover gasket.

Agree, extremely unlikely that it was caused by your tune.

Neil

[BMWM.D.]

Originally Posted by Monster900

Front of the engine is clean. The leak is definetly in the back pass side of the engine.

I've seen quite a few N54 valve covers crack lately. Every one I've seen has been in the area of the PCV system, kind of behind the oil cap. You'd need to remove the engine cover to see it, though.

[Monster900]

Originally Posted by BMWM.D.

I've seen quite a few N54 valve covers crack lately. Every one I've seen has been in the area of the PCV system, kind of behind the oil cap. You'd need to remove the engine cover to see it, though.

I hope that this is the case as it would be an easy fix as replacing vc which I was planning to do anyways due to the crack in the front. We will see tomorrow. I will keep you guys posted on my findings.

[Monster900]

So, I replaced VC, plugs were in oil bath It took good hour to get all of the oil out. Afterwards I got underneath of the car to look for oil leaks. The front turbo was dry, I couldn't get a good look at the rear turbo but I did see oil on the waist gate actuator. Now the question is if oil came from the turbo or VC gasket/ crack. I guess we will find out. While I was underneath I have noticed small coolant leak on the driver side right over intercooler cold air out where coolant drain plug is located also the trey on the left side was wet, any ideas? I am considering to uninstall COBB and go back to OEM maping and see if leak coms back (I hope it won't).