Looking at buying a 2015 C350.. Need some insight
05-21-2019, 02:48 PM
#1
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BMW 128i
Looking at buying a 2015 C350.. Need some insight
Hello all,
i am looking at trading my 2011 128i in for this C350:
https://www.mercedes-benz-boundary.c...gj8jb1fg369112
My 128i has had issues with oil leaks etc... Was wondering how these cars are reliability wise? Thanks!
i am looking at trading my 2011 128i in for this C350:
https://www.mercedes-benz-boundary.c...gj8jb1fg369112
My 128i has had issues with oil leaks etc... Was wondering how these cars are reliability wise? Thanks!
Last edited by Kali79; 05-21-2019 at 03:00 PM.
05-21-2019, 05:28 PM
#2
MBWorld Fanatic!
My mom has an ML350 with the same engine, so this might be relevant. At 144K, there was oil found in the engine harness. It's caused by a failed cam magnet allowing oil to seep out past the cam magnet and travel through the harness under the wire insulation. I checked a bunch of plugs all over the engine bay, and I found oil in all the coil plugs and also the ECU was full of oil. Apparently, it's a known issue with the M276 engine and other current and previous MB engines. She had the dealer replace the ECU, all coil packs, all O2 sensors, and the whole engine harness. Pricy.
There is an OEM solution called isolation wires for a previous engine in the W203 chassis, but honestly, it looks like a two plugs connected by six inches of wire that sit between the cam sensor and the cam sensor plug. Not really sure how that's supposed to isolate the oil from the engine harness if the oil seeps between the insulation and the actual metal wire, but if anyone knows, I'm curious. Not sure if there's set of isolation wires for the M276 engine, but maybe they're the same plugs? Here's a thread about it:
https://mbworld.org/forums/c-class-w...m-sensors.html
Other than that, her car hasn't had an issue related to the engine.
There is an OEM solution called isolation wires for a previous engine in the W203 chassis, but honestly, it looks like a two plugs connected by six inches of wire that sit between the cam sensor and the cam sensor plug. Not really sure how that's supposed to isolate the oil from the engine harness if the oil seeps between the insulation and the actual metal wire, but if anyone knows, I'm curious. Not sure if there's set of isolation wires for the M276 engine, but maybe they're the same plugs? Here's a thread about it:
https://mbworld.org/forums/c-class-w...m-sensors.html
Other than that, her car hasn't had an issue related to the engine.
05-22-2019, 03:20 PM
#3
MBWorld Fanatic!
Several people on here dislike the M276 engines. You'll hear about start-up noises from the cam chain tensioners, about carbon build up on the intake valves, and this post about oil leaking into electronics (or one guy said, into the air filter housing). Do a search, those are the ones I remember seeing.
Some people are just chagrined that Mercedes developed it jointly with Chrysler during their ill-fated marriage.
The good news is, a 2015 will have all the fixes since the engine's 2012 introduction. Does that mean you'll never have a problem? Not sure we can say that, but it should be more reliable than previous years.
Some people are just chagrined that Mercedes developed it jointly with Chrysler during their ill-fated marriage.
The good news is, a 2015 will have all the fixes since the engine's 2012 introduction. Does that mean you'll never have a problem? Not sure we can say that, but it should be more reliable than previous years.
05-22-2019, 03:34 PM
#4
Super Member
Several people on here dislike the M276 engines. You'll hear about start-up noises from the cam chain tensioners, about carbon build up on the intake valves, and this post about oil leaking into electronics (or one guy said, into the air filter housing). Do a search, those are the ones I remember seeing.
Some people are just chagrined that Mercedes developed it jointly with Chrysler during their ill-fated marriage.
The good news is, a 2015 will have all the fixes since the engine's 2012 introduction. Does that mean you'll never have a problem? Not sure we can say that, but it should be more reliable than previous years.
Some people are just chagrined that Mercedes developed it jointly with Chrysler during their ill-fated marriage.
The good news is, a 2015 will have all the fixes since the engine's 2012 introduction. Does that mean you'll never have a problem? Not sure we can say that, but it should be more reliable than previous years.
