Turbo oil in the exhaust?

JEREMYBWEIR

MEMBER
2014 MERCEDES BENZ CLA 45 AMG
2.0L
4 CYL
TURBO
4WD
AUTOMATIC
115,000 MILES

Hello, I'm trying to figure out a couple things. I've noticed it taking longer then normal to get up to operating temp (I replaced the thermostat last year, still seems like it might be an issue?). Also, where all of this oil has come from in my turbo and exhaust. I have included some pics along with the codes I'm getting. The video shows the wastegate and some in and out play, obviously, the low boost code from the wastegate not shutting properly but I don't think there should be that much play? The turbo is an aftermarket, Pure 650 and was installed in July '24.
The O2 sensor thing is most likely just from the high amount of oil in the downpipe.
Here's a link for the pics of the turbo oil, codes, and a video of the play in the wastegate. https://drive.google.com/drive/folders/1xtH198DC7mhHeg2xIHuasrfQF07Tp4qR?usp=sharing

Friday, December 12th, 2025 AT 7:48 PM

2 Replies

LOU P

MECHANIC
119 POSTS

Hello my name is Lou, Mercedes tech and YouTuber. I see you are having some troubles with the CLA45. I would like to ask a few questions if I may? Like was this an oem thermostat? Like from the dealer? As we find that any aftermarket or even the same brand thermostat but comes from outside the dealer does not work as efficiently as an oem one. So that can be an issue. As for the oil, I would recommend replacing the crankcase vent line assembly due to the codes, also that can cause oil loss into the intake tract. As for your Turbo and the oil that we seen, is there any play in the impeller? Actually I just rechecked the google drive and seen the play, that is not good at all, its like its missing an clip to hold it in place. By that video, the turbo will need replaced if it cant be serviced by the company you got it from, that can and will cause the low boost code because you will have boost loss from it not closing properly and also moving out of the way and allowing boost to bypass the valve. Let me know your thoughts, Lou Palomino
Master tech Lou YouTube

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Saturday, December 13th, 2025 AT 9:22 AM