E400 Coupe Reliability
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From: Orlando, FL
2016 E400 Coupe (C207)
E400 Coupe Reliability
I recently purchased a CPO 2016 E400 Coupe with just over 12,000 miles on it. My previous car was a normally-aspirated BMW 328i, which I consciously chose instead of the 335i because the turbocharged version of the 3-Series was notorious for wastegate problems and high-pressure fuel pump failures.
Can anyone comment on the reliability of the E400? I was somewhat reluctant to go with a turbocharged engine because of the reported problems with the BMW, but this car is in very fine shape, has all the other features I wanted, and very low mileage. Are there any commonly-reported issues with the E400?
Can anyone comment on the reliability of the E400? I was somewhat reluctant to go with a turbocharged engine because of the reported problems with the BMW, but this car is in very fine shape, has all the other features I wanted, and very low mileage. Are there any commonly-reported issues with the E400?
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From: Chicago area
2015 E400 and 2015 GLK350
It is probably too early to tell, as the E400 drivetrain was new (to the US) in 2015, so none of them are high-milers yet. I took the approach that this drive train was in use in other countries and we didn't hear of problems on this or other internet boards, so it was probably pretty well de-bugged already when I bought my 2015. I have just over 20K miles now, with no issues. I also take the position that as long as it is under warranty, I won't worry. I checked the MB factory and extended warranty wording, and turbo's, etc. are covered. I'm just enjoying the car and will worry about potential issues only when they are real.
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From: Orlando, FL
2016 E400 Coupe (C207)
Thanks for your input, Steve. Do you know how long this engine was in production outside the U.S. prior to 2015?
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From: Central Jersey
2003 E500, 2004 G35X
E400 has been around for several years. The main reason I bought my 2017 in April and did not wait for the 2018 model was the concern with the 2018 first year model which is based on the 2017 E300. Some owners have reported a lot of problems with their 2017 E300. Besides, to me, the 2017 coupe looks a lot better than the 2018. It does not matter to me the chassis is based on C. To cut cost, all mfg. use their chassis for various models, nothing new here.
Got burn with my first year E500, will never buy another first year model regardless of make. Heck, when I picked up the new E500, upon starting the engine, there was a check engine light. Service mgr. came to check it out. Turned out to be a fuel sending unit which has to be ordered, so I had to come back for the repair later. Talk about embarrassment to the dealer!
Got burn with my first year E500, will never buy another first year model regardless of make. Heck, when I picked up the new E500, upon starting the engine, there was a check engine light. Service mgr. came to check it out. Turned out to be a fuel sending unit which has to be ordered, so I had to come back for the repair later. Talk about embarrassment to the dealer!
Thread Starter
Super Member
Joined: Sep 2017
Posts: 738
Likes: 163
From: Orlando, FL
2016 E400 Coupe (C207)
E400 has been around for several years. The main reason I bought my 2017 in April and did not wait for the 2018 model was the concern with the 2018 first year model which is based on the 2017 E300. Some owners have reported a lot of problems with their 2017 E300. Besides, to me, the 2017 coupe looks a lot better than the 2018. It does not matter to me the chassis is based on C. To cut cost, all mfg. use their chassis for various models, nothing new here.
Got burn with my first year E500, will never buy another first year model regardless of make. Heck, when I picked up the new E500, upon starting the engine, there was a check engine light. Service mgr. came to check it out. Turned out to be a fuel sending unit which has to be ordered, so I had to come back for the repair later. Talk about embarrassment to the dealer!
Got burn with my first year E500, will never buy another first year model regardless of make. Heck, when I picked up the new E500, upon starting the engine, there was a check engine light. Service mgr. came to check it out. Turned out to be a fuel sending unit which has to be ordered, so I had to come back for the repair later. Talk about embarrassment to the dealer!
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From: Central Jersey
2003 E500, 2004 G35X
I don't think so as I have not seen any CD, just the printed manual. As for reliability of turbo, MB has been doing it for a long time including AMG models. I would not be that much concerned with it. Used to be after a long hard run, such as doing 75+on the hwy on a hot summer day, when you stop, don't shut off the engine, let it idle for a few minutes to cool the turbo with the motor oil. I would suggest you do this old fashion way.
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From: Orlando, FL
2016 E400 Coupe (C207)
As for reliability of turbo, MB has been doing it for a long time including AMG models. I would not be that much concerned with it. Used to be after a long hard run, such as doing 75+on the hwy on a hot summer day, when you stop, don't shut off the engine, let it idle for a few minutes to cool the turbo with the motor oil. I would suggest you do this old fashion way.
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From: Central Jersey
2003 E500, 2004 G35X
The hot turbo still needs to be cooled down and the only way to cool it is the motor oil. I have not read any new tech that can cool the turbo otherwise. I am sticking to the old school to idle the motor a while after a hard run in the summer. I will not do an immediate shutdown of the motor.
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2017 C43
The hot turbo still needs to be cooled down and the only way to cool it is the motor oil. I have not read any new tech that can cool the turbo otherwise. I am sticking to the old school to idle the motor a while after a hard run in the summer. I will not do an immediate shutdown of the motor.
Casual drive down to the local hangout spot? Better let the car idle for 2 minutes after i get out
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From: Miami, FL
2003 CL 600
The hot turbo still needs to be cooled down and the only way to cool it is the motor oil. I have not read any new tech that can cool the turbo otherwise. I am sticking to the old school to idle the motor a while after a hard run in the summer. I will not do an immediate shutdown of the motor.
No fear to shut the car down after some 'spirited' driving. It will handle it.
As to the OP, they have been very good engines so far, some rare injector failures like the n/a 276 but nothing major, and FAR more reliable than the BMW engines, no valve coking issues at all on the MB direct injection engines thankfully.
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From: Orlando, FL
2016 E400 Coupe (C207)
These turbos are also water cooled by the engine coolant. The car also has auxiliary coolant pumps and can run the fans and them after shutdown, so the turbos never get hot enough to burn the oil in them.
No fear to shut the car down after some 'spirited' driving. It will handle it.
As to the OP, they have been very good engines so far, some rare injector failures like the n/a 276 but nothing major, and FAR more reliable than the BMW engines, no valve coking issues at all on the MB direct injection engines thankfully.
No fear to shut the car down after some 'spirited' driving. It will handle it.
As to the OP, they have been very good engines so far, some rare injector failures like the n/a 276 but nothing major, and FAR more reliable than the BMW engines, no valve coking issues at all on the MB direct injection engines thankfully.
I brought my car to the dealer a few days ago to ask them about a light metallic tapping/ticking sound at idle when the hood is open. They stated that this is produced by the injectors and normal for the engine. Any thoughts/comments on that explanation?
Last edited by Mr. Toad; Sep 27, 2017 at 08:53 AM.
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'71 Pinto
The actuation of the wastegate can be changed via Xentry so that it remains closed for longer in partial load operation. However, actuation change can lead to slight hissing noises from the turbocharger. See attached bulletin.
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From: Orlando, FL
2016 E400 Coupe (C207)
The document says that this occurs during "partial load operation" and the engine is being revved in the accompanying audio file. I'm hearing the noise at resting idle; do they consider that "partial load"?
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From: Miami, FL
2003 CL 600
The update actually changes the boost response a little bit, which actually results in the turbos coming on sooner, as the wastegates stay closed longer. I haven't really driven one hard before/after to tell if it's noticeable, but it can't hurt.
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From: Orlando, FL
2016 E400 Coupe (C207)
That concern is only when revving or on startup, will not happen at a steady idle. Different issue.
The update actually changes the boost response a little bit, which actually results in the turbos coming on sooner, as the wastegates stay closed longer. I haven't really driven one hard before/after to tell if it's noticeable, but it can't hurt.
The update actually changes the boost response a little bit, which actually results in the turbos coming on sooner, as the wastegates stay closed longer. I haven't really driven one hard before/after to tell if it's noticeable, but it can't hurt.
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From: Miami, FL
2003 CL 600
Nope, the constant idle noise is just the high pressure pump and injectors doing their thing, they operate on around 1500psi at idle and the solenoids in them are big and powerful, they make noise. With the engine covers, hood insulation and body insulation, you won't hear it inside the car. But if you open the hood you hear it for sure. Normal for a 276 or any direct injection motor really.
