stratman

Hi All,
This is the first car I've owned with the start/stop tech and I feel that this may shorten the life of the starter but also (unless there is a secondary oil pump that is continuously on during the engine off sequence at a stop light) may increase engine wear due to oil settling when off. Am I missing something or is the starter different than a traditional starter and what about extra engine wear? I'd really like to hear from you all as to your thoughts and/or expertise on this subject.

bobblehead

I hate this feature. Some say it does not put extra wear on the starter, I really doubt this claim.

I simply engage the sport mode every single time I start my car and forget this nonsense.

CanuckE63

There is definitely more wear and tear on a few components with this setup but it shouldn't impact the vehicle in the short term at least.
It's a fuel efficiency issue afaik, so they have to do it unfortunately.
Too bad there isn't an easy way to disable permanently.

Carac

Doesn't it just stop the engine pre-detonation on some cylinders? Then the restart is just detonating the compressed cylinders combined with some drivetrain trickery? I was under the assumption that's why it doesn't stay "off" indefinitely at a long light or stop, because eventually just igniting the compressed cylinder won't work. But I could be completely wrong. I just know most systems don't use the main starter.

S63AMG888

iTrader: (3)

V70cat

You are clearly adding more wear to the starter.

If the engine has been running the last thing you want to do is shut it down at a red light.

BC-2

Yes, the starters for Eco start stop systems are different and designed for the additional start cycles so there shouldn't be a concern there. Also, the engines use a crank hall sensor that can tell the computer which cylinder is in the best position to start the engine quickly and smoothly. Extra fuel is added to that cylinder to help quicken the restart. In terms of wear due to oil settling, maybe if it sat for an hour or more but its literally only minutes or less and the engine will only activate start stop when it's up to operating temp. So there is no additional wear in this regard. Basically, any additional wear is accounted for and designed accordingly. Having said all that, I shut Eco Start Stop off every time I start my car because I find it annoying.

V70cat

What about oil flow to turbos and other key bearings?

BC-2

The lubrication system for the turbos keeps running for several minutes after the engine is shut off to avoid heat soak and frying the bearings. This is why you can hear fans and such continuing to run in our E63's after we shut off the engine and walk away. Same thing happens when Eco Start Stop is functioning. There's really nothing to worry about with Eco Start Stop. Annoying, yes. Wear, no.

E634Me

I would like to think that Mercedes put at least a little thought into what happens to a motor when it is shut off when hot (or cold) and frequently restarted.

I haven't had any qualms about using the feature on my car. When I picked it up in Germany and started off on our vacation the first time it turned off was a bit of a surprise. For the first day or two we turned off the feature, but after a bit got used to it. Now I leave it on when in comfort mode in town.

With the car averaging about 12.5 MPG on my short drive to work saving a bit of fuel here and there is fine with me.

opherhenry

tirzaman

kcjonz

pentium7

Is this start/stop and cylinder deactivation the reason E63S is able to get away with no gas guzzler tax whereas the M5 has one?

SoCalRick

Really? Can you quote the information that you are referring to from the manual? I have read and reread the ECO start/stop section in the MY18 E Class Sedan Operators manual and haven't seen any such assertions. What am I missing?
-SCR

E63Wagonesque

stratman

I reread the supplemental manual for the wagon and found that by pressing the button on the console ("A") this will disable the start/stop feature as well as the cylinder deactivation and glide mode functions while driving in "C" mode. Problem is that every time the ignition is shut off and restarted in "C" mode these features are automatically reactivated and the button has to be pressed again. So I'll put up with this as it's a simple button to push but will probably activate it while on the freeway and such. I've got <1k miles so I'm still driving in "C".

tonecas

i've always questioned myself about this but I must trust that manufactures know what they are doing. the eco start and stop is been rolled on in every car on every brand, from the most cheap to the most expensive ones in Europe. i believe it is more annoying than actually be really more damaging in the medium turn to the car components

Pertplus

Interesting because in my MY2017 X5M, once you pressed the "A" button, it never went back on again. But for the new Mercedes, you have to constantly disable it everytime you turn the engine back on again? I wonder if BMW eventually went this route too or just mercedes and others that have been doing it already.

tirzaman

tonecas

like the subliminal message for MB