W204 C63 Gear box issue?

[W1ghty]

I noticed when I changed my gearbox oil and the kit that there are a few different grades of oil.
what would happen if this oil was slightly thinner?
could it cause this.

Gearbox oil is either the correct MB specification or it’s the wrong oil .

 

[W1ghty]

@alexanderfoti thank you for the advice, I have booked the car in to sort out the mct unit and adaptations. @philnewmerc there is definitely an issue, I’ve had the car for 2 years now and it there’s a noticeable difference. Can anyone recommend someone who is a specialist in dealing with Mercedes/amg’s as I would much rather take it to them, I don’t mind travelling.

Any update ?

 

[RSTurbo50]

I’d move it on, maybe Webuyanycar? Money pits sadly

 

[alexanderfoti]

Only one type of oil per box!

 

[T44nka]

Any update ?

No updates at the moment, went away for a couple of weeks over Christmas and didn’t want to think about the car because it’s so stressful when there is isn’t a straight forward fix. I think im just going to drop it off at the gearbox specialist and tell him to take it apart. Once fixed I will probably move it on. I don’t enjoy driving the car anymore because I know it’s not what it used to be. Bit sad really, like RSTurbo said it’s just an endless money pit. You need to have really deep pockets to fully enjoy a car like this. I brought this car because I fell in love with it whilst driving it to a garage who had purchased it from auction and I told them I wanted it! I brought it 2 days later. I have no regrets other than not being better off financially to enjoy every second of owning it. Every person I’ve spoken to that has owned one has always mentioned the very high cost of running it and also the extra headache of protecting it from potential theft or damage whilst out and about. And sadly I’ve experienced both. Even had somebody key all down the side of the car……. What is wrong with people??!!

 

[Spider10]

Ive had 2 and didnt find them over expensive to run or maintain
I know rsturbo50 had a lemon nothing but problems from day 1 with these i find dont let your head (or ears) rule same as any car there's shite out there but also there's good hope you sort the issue and enjoy

 

[T44nka]

Ive had 2 and didnt find them over expensive to run or maintain
I know rsturbo50 had a lemon nothing but problems from day 1 with these i find dont let your head (or ears) rule same as any car there's shite out there but also there's good hope you sort the issue and enjoy

I know absolutely nothing about cars and shit myself when any kind of warning light comes on and think it’s the end of the world if I had even any basic knowledge and a good local specialist then I think I would be fine. But the truth of the matter is I was never financially ready to own one. Any little issue arises and I’m too scared to get it checked out and I’ve no confidence in main dealers and there’s no decent specialist locally. I know i haven’t looked after it the best, ie knocking it into N whilst driving, just so I can give it a ROAR! I also borrowed it out a lot so it’s been driven a bit excessively. Does anyone think putting it in N whilst driving could be the issue with it and has gradually taken its toll on the transmission?

 

[philnewmerc]

For automatics the advice is usually not to coast in neutral. But as long as the engine is running the box will have lubricant being circulated so personally I can't see a problem. But if your car has the mct wet clutch system perhaps that doesn't like it... but again I can't see why.

There is another thread on here about the wet clutch mct causing problems, so maybe it is a weak point on these. Has it done many launch controls?

Btw, if you want worry free relatively inexpensive AMG experience I think many people would agree that the older m113 based engines with the 5 speed gearbox are v reliable:, E55, cls55, slk55, clk55, c55

 

[Spider10]

Until you replace the radiator at £1,000 coasting in N revving its B---lls off isn't going to do it any good isit , this is why there's loads of shite out there
If you want cheap motoring buy a vag 1.9 PD

 

[350cls]

For automatics the advice is usually not to coast in neutral. But as long as the engine is running the box will have lubricant being circulated so personally I can't see a problem. But if your car has the mct wet clutch system perhaps that doesn't like it... but again I can't see why.

There is another thread on here about the wet clutch mct causing problems, so maybe it is a weak point on these. Has it done many launch controls?

Btw, if you want worry free relatively inexpensive AMG experience I think many people would agree that the older m113 based engines with the 5 speed gearbox are v reliable:, E55, cls55, slk55, clk55, c55

Absolute bu.ls.it

 

[philnewmerc]

Absolute bu.ls.it

How so?

 

[350cls]

How so?

Where is your conclusive evidence of such a statement?

 

[philnewmerc]

Where is your conclusive evidence of such a statement?

Without conclusive evidence present, one has to use engineering knowledge. If you have some other theory, please enlighten us.

There are, I think, 2 ways of looking at this:
1) Assuming selecting N disengages the mct wet clutch (as in a manual car):
According to MB themselves the MCT wet clutch is designed to coast in neutral (ie like pressing the clutch pedal at speed):
"When the driver releases the accelerator in a speed range between 37 and 99 mph, the clutch of the MCT transmission opens and the engine is decoupled from the powertrain."
Would coasting (which it is designed to do) and revving the engine damage a disengaged clutch? Well, unless this one always drags significantly, no. (But I can't say I'd ignore MB advice not to!) Plus I am under the impression the mct clutch allows the engine to blip on down shifts too (ie rev with clutch disengaged as the op apparently has).

Other view:
2) Shifting into N disengages the automatic transmission clutch pack (as in a normal auto):
In this case as a normal auto is shifted into N it also disengages a wet clutch pack but not the torque converter (in place of the clutch). This is one reason it is advised to keep a car in D when stopped temporarily. Some think this is because the clutch is wearing in N due to drag but that's not really true. The bulk of the wear occurs when moving back into D, i.e two shafts with a speed of 800 rpm and 0 rpm have to be dragged (by the wet clutch) up to speed, and that's a wear process. Also, when you think about it, nobody says you cannot rev the engine in neutral.

Anyway, I don't think either of those two scenarios above would cause this damage.
So, would repeated hard acceleration with clutch sliding be far more likely to damage it? Yes: any manual clutch will wear far more quickly (and break) if abused - the mct design flaw imho is that the wearing knackered mct wet clutch then sends its wear debris circulating through the standard automatic transmission and so fecks that too. Torque converters are much more robust to launch control kind of treatment because there is no physical connection between the input and output side, only fluid pressure.

 

[350cls]

You have highlighted your engineering theories of the mct gear box, but as you have said it's not conclusive evidence that it's a weaker gear box overall. All auto gear boxes have some issues throughout the life span. Especially the way the op describes he's particular car/gear box as being treated, not only by himself.

Have read up on hundreds of issues with the mercedes 5 speed gear box. And encountered a few myself.

 

[philnewmerc]

You have highlighted your engineering theories of the mct gear box, but as you have said it's not conclusive evidence that it's a weaker gear box overall. All auto gear boxes have some issues throughout the life span. Especially the way the op describes he's particular car/gear box as being treated, not only by himself.

Have read up on hundreds of issues with the mercedes 5 speed gear box. And encountered a few myself.

I've never said it's a weak gearbox.

 

[350cls]

For automatics the advice is usually not to coast in neutral. But as long as the engine is running the box will have lubricant being circulated so personally I can't see a problem. But if your car has the mct wet clutch system perhaps that doesn't like it... but again I can't see why.

There is another thread on here about the wet clutch mct causing problems, so maybe it is a weak point on these. Has it done many launch controls?

Btw, if you want worry free relatively inexpensive AMG experience I think many people would agree that the older m113 based engines with the 5 speed gearbox are v reliable:, E55, cls55, slk55, clk55, c55

Your owns words (weak) !

 

[philnewmerc]

Your owns words (weak) !

You've got the wrong end of the stick. In the replies above I'm talking about the *MCT wet clutch* being a possible weakness not the box itself.

 

[alexanderfoti]

You've got the wrong end of the stick. In the replies above I'm talking about the *MCT wet clutch* being a possible weakness not the box itself.

And they are, we change far more MCT units than torque converters. You do need to consider how they are driven etc.

 

[Bobby Dazzler]

Your owns words (weak) !

That’s not what @philnewmerc wrote. He said the wet clutch could be a weak point. No need to defend on this one.

 

[alexanderfoti]

That’s not what @philnewmerc wrote. He said the wet clutch could be a weak point. No need to defend on this one.

No defending, I just think that is the OPs problem.