[Coolcat12]

i have a BMW 550i 2013 the m sport variant when i bought the car we noticed bit of a oily smell and didn't think much about it. we start noticing at engine operating temperature when we give it some gas the cabin starts to smell like exhaust fumes and oil. we have done many things we have taken it to the mechanic multiple times and the mechanic changed most of the seals and gaskets like the turbo lines and more. no luck we have no idea what it is and i dont feel like taking it to the stealership we also had the mechanic have a search of the whole car and nothing. please help

[Coolcat12]

we have also made sure that it is not a burning oil smell and when i turn off the ac and floor it, the smell still comes in.

[Thecastle]

You either have some residual oil from a previous leak that will burn away and you will no longer smell oil, or you still have an active oil leak. Most mechanics will put in a dye into the oil and then use a special light to check for active oil leaks.

The common oil leak areas on these cars are in no particular order
1) rear main seal
2) oil pan
3) valve cover gaskets
4) broken CCV lines
5) turbo oil return block
6) turbo oil lines
7) bad valve stem seals

I've done all of these, some like the rear main seal multiple times. But you have an oil leak somewhere and unless you find it and repair it you need to take it to someone who can.

You don't list what leaks your mechanic found and repaired.

The test for bad valve steam seals is to warm the car up to full operating temp. Then let it sit and idle for at least 5 minutes. With a friend standing behind the car, quickly floor the car in park. If you see smoke out the exhaust you have bad valve stem seals which is common on n63's about every 60-70K miles.

[Coolcat12]

Ive talked to my mechanic about this and he said that he repaired all of these. Im going to try a new engine oil cap. And the mechanic has said there is no oil leak in the engine or outside. And i dont think its residual oil cause we have floored the gas multiple times when we drive it. Thank you for your wisdom and answering my thread.

[Coolcat12]

Originally Posted by Thecastle

You either have some residual oil from a previous leak that will burn away and you will no longer smell oil, or you still have an active oil leak. Most mechanics will put in a dye into the oil and then use a special light to check for active oil leaks.

The common oil leak areas on these cars are in no particular order
1) rear main seal
2) oil pan
3) valve cover gaskets
4) broken CCV lines
5) turbo oil return block
6) turbo oil lines
7) bad valve stem seals

I've done all of these, some like the rear main seal multiple times. But you have an oil leak somewhere and unless you find it and repair it you need to take it to someone who can.

You don't list what leaks your mechanic found and repaired.

The test for bad valve steam seals is to warm the car up to full operating temp. Then let it sit and idle for at least 5 minutes. With a friend standing behind the car, quickly floor the car in park. If you see smoke out the exhaust you have bad valve stem seals which is common on n63's about every 60-70K miles.

Thank you for replying

[Ekohler2424]

Probably stupid/obvious question, but it doesn't have catless downpipes on it does it? just sounds awfully characteristic of those.
Just curious to know what the issue turned out to be though, if it was in fact an oil leak.