Uncertainty about gearbox maintenance

[Workerat]

Greetings.

My W213 E63S seems to have jerking during stop-start situations in slow-moving traffic. After doing some research, it seems that this issue is rather widespread among C/E63 models.

Therefore, I made the decision to provide her with a gear box servicing at an independent establishment. Upon opening the package, the individual discovered metallic objects adhered to the magnets. I have included photographs for reference. Based on my research, it seems that a gearbox service should have been conducted after the first period of use. I have verified with Mercedes that this service was not performed. We have chosen to quickly replenish the fuel and then undergo a complete maintenance service after about 400 kilometres. The concept is that if any further fragments appear, it is indicative of a more significant problem rather than merely residual remnants. I am not too worried at this point because the warranty should cover any costly concerns.

I have attempted to get further information on the quantities of refill oil and the periods for servicing, but I am now perplexed.

What is the required quantity of oil to replenish the gearbox?
Does the wet clutch of the 9g MCT box need oil? If yes, what is the specific amount?
I have seen details with a capacity that varies from 5 litres to 10 litres.
Mb provided me with a quotation amounting to 8 litres.
I am rather perplexed by the distinctions between the torque converter and the MCT. To be candid, I lack expertise in mechanics. Therefore, any information elucidating this matter would be much appreciated, as it would enhance my comprehension.

[Workerat]

[MutanX]

It is quite unlikely that any motherboard would need an automatic gearbox fluid (ATF) service after the running-in time.

[Workerat]

I have read several sources on engine and automatic gearbox fluid (ATF) adjustments after the break-in period, which is why I am now perplexed. In addition to varying quantities of ATF, there seems to be a multitude of conflicting pieces of information available.

 

[MutanX]

After extensively studying several sources on engine and automatic gearbox fluid (ATF) modifications after the break-in phase, I am now puzzled. Aside from the various amounts of ATF, there seems to be a plethora of contradictory information accessible.

[Istairde]

When you say "Indy," do you mean a regular garage rather than a specialised garage for Mercedes-Benz vehicles? Due to their knowledge.

[Cassole]

On my GLA 220d 4matic with a 9g automatic gearbox, there is a quite intricate process for refilling the fluid. This process involves using Star/xentry to test temperatures and cleanse the system, as well as purchasing a dipstick. The dipstick requires a filling at a level within a range of 0.5-1mm, indicating a high level of sensitivity. Some of the AMG variants need the use of supplementary oil additives. I have been researching it as I am considering doing it independently...

[Workerat]

No, it is only a garage for motorbikes. I am receiving conflicting information from both them and mb plus online, which is why I am seeking clarification. Provide me with the necessary electrical connections and I will be fully functional. I have never been proficient at manipulating digital components.

[Boxck]

An MCT gearbox, without a torque converter, likely holds a few litres less fluid compared to one equipped with a torque converter. The MCT gearbox would likely use identical cooling lines and a radiator as a non-MCT gearbox.

An independent consultant in management and business should possess these knowledge.

[Workerat]

Appreciation expressed.

[Kiddokt]

Although I can only provide speculation, this situation seems intriguing, so I will provide my opinion.

In my observation, the MCT gearbox seems to be a conventional automatic gearbox without a torque converter, specifically located between the engine's output and the gearbox's input. The MCT bit refers to a novel technique (in this particular application) that use a clutch instead of a TC, similar to a wet clutch seen in motorcycles. The proof you have provided consists of two observations: 1) the presence of jerky movements during slow driving, and 2) the detection of metal particles resembling swarf on the magnetic pickup. The MCT clutch is composed of alternating metal plates and clutch plates, which slide together during operation. The use of 'wet' oil ensures that the clutch remains cool and prevents the accumulation of wear debris, which is directed away from the clutch and towards the filter to prevent any blockages. However, the origin of the metal fragments adhered to the magnet remains unknown - but from which source? If the gearbox oil is shared with the clutch oil, the source of the oil might be either: a) the MCT clutch, b) the different wet multi-plate clutches used for gear change in the gearbox, or c) another component such as a deteriorating bearing or gear. Based on the absence of any mention of abnormal sounds and the occurrence of slow speed jerkiness, it is possible that a malfunctioning MCT (Multi-Clutch Transmission) might be the cause. This could be attributed to excessive wear leading to metal-on-metal contact. The wet multi-plate clutch has shown its effectiveness in motorcycles and automatic transmissions, but it has not been extensively tested in very heavy and high-powered vehicles. Repeated instances of rapid acceleration with clutch slippage, such as during launch control events, can significantly reduce the lifespan of the clutch. In my own perspective, clutches (whether wet or dry) should be seen as a binary mechanism, where power should be gradually and swiftly applied, and only then fully engaged. Any alternative approach will inevitably result in the clutch being a regularly damaged component, similar to what happens with racing cars. On the contrary, a TC is specifically engineered to smoothly engage (and contemporary models engage firmly for optimal performance).

[Boxck]

OP, you have not specified the mileage or age of the automobile.
 

[Boxck]

Tasos is very knowledgeable.

The video demonstrates the presence of wear in the barrel where the clutch plates make contact, which is evident around the two-minute mark. This is a typical occurrence in bikes that are either old or have been inadequately maintained. Consequently, it leads to a jerky shifting experience. It seems unlikely that what you are seeing is related to aluminium filings sticking to magnets. However, it may be worth examining this possibility for informational purposes. I do not think it is a case of magnetic confinement fusion (MCT).

[Workerat]

The current value of the item is 19,500, but I purchased it for 8,200 on May 23, 2019, and it has been registered.

[Kiddokt]

Are there several instances of full-power launches?

[Workerat]

I have completed two tasks after first acquiring it. However, to be honest, the speed at which I had to do these tasks was too rapid for my liking, therefore I have refrained from undertaking any further tasks since then. Regarding the 8000 miles prior to my ownership, I am uncertain about the level of care and maintenance it received, but it seems to have been attended to. However, one can never be really certain.
The sole issue was a little oil leakage on the gearbox sump, which went unnoticed at the service in May. It seems to have occurred thereafter, since 5 litres of oil were emptied.

Edited January 26 by Workerat