2013-2018 Cadillac ATS 2.0T - Oil Leak 

Hope it works for you. I had to inspect it very carefully to see the leak was from the turbo oil line. Look for oil standing in places near the area. Once I fixed this, it took about 2 weeks for the residual oil to fully burn off but now there is no more burning oil smell for me.

Hey what did that smell like? Currently get a really nasty burnt smell when I come to a complete stop... I'm thinking it could be this? Sort of smells like a plastic burn smell, friend of mine is thinking the smell is oil.

@@kaenenmclaren7596 it was more sweet smelling which was my headgasket blown LMAO

although I've never experienced a P1101 personally, I can see how a broken PCV line could cause the computer to think the MAF was not working properly. Hopefully that issue is resolved now. Normally you get the lean code P0171 from the vacuum leak first. As far as the oil leak goes, it is best to find the fresh wet oil drop under the car and do your best to trace it up to where it came from. The hardest part with these cars is all the plastic panels underneath that can make it hard to do. If you dont smell burning oil though, chances are it is not related to the turbo feed or return line. That sucker gets very hot and will definitely burn the oil.

@@JeffLyle the code went away and they told me no leaky oil and valve cover gasket was not the issue. Drove home car seemed fine. Next day I was going to work. When I sped up to get on Expressway, car started to shake. Check engine light flashung, traction control and service stabililok message came on. After 30 seconds, it turned off. But once I slowed down or sped up, I could feel the shaking. I called dealership, they said its a different problem, it will be a new work order. I had a scanner, got code p0302. Engine misfire. That explains the shaking. I have to bring it to someone else, not driving car in the meantime. I thought maybe something got wet, I let it dry out but it still does it. In idle its ok, but once I speed up, I can feel it. I looked on cadillac forums and reddit. Quiet a few instances regarding this but no concrete solution.

@@locutus1126since it’s not a random misfire code and it’s isolated to #2, I would suggest swapping the plug in #2 to another cylinder. Then go drive it and see if the misfire moves with the “bad” plug. If it doesn’t, then move the coil packs. If the code moves to the cylinder that the bad part went too, you will know what needs to be replaced.

@@JeffLyle I did that yesterday, when I took out the ignition coil, the pocket was full of oil. I checked the others and they had oil as well. So I assume that is the issue. Fricken dealership, I brought in for oil leak and I said it may be the valve gasket. They said it's not the issue. Maybe the large, outside one was ok but the 4 around the spark plugs are leaking like sieve.

@@locutus1126not a big fan of the stealership. Sounds like you found it though. Good luck with it. Let me know if that fixes it!

The part can be found on Amazon or Rockauto or a bunch of places. I bought the whole Supply Line Assembly that comes with the banjo bolt and the seals. It was GM Genuine 12679314. Total cost with shipping and taxes was about $35. Just make sure to get the SUPPLY line not the RETURN line if your leak is in the same location