Differential Oil Change.

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Spro368

Member
Joined
Feb 9, 2021
Messages
48
Location
Wiltshire
Car
Mercedes C63 AMG
Upon agreeing to purchase my AMG C63 in February 2021 the dealer agreed to change the differential oil prior to collection as it appeared not to have been changed.It now transpires they changed the gearbox oil by mistake instead.They agreed to change the Diff oil recently and upon checking the oil (I got them to save a jar full) it looks pretty dirty and has fine particles of metal.

I read on the Forum the Limited Slip Differential (LSD) has metal plates which create the particles.The attached photo shows the oil but that is not proof of any issue so I am sending off a sample to Miller Oils UK lab for analysis. I will share the results Which hopefully will be OK.

It is a shame the dealers don’t bother with the running in diff oil change. Maybe that’s because it’s free to the customer !!!
 

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I agree , it's shocking that this basic job has been missed . It is a subject that is discussed far too often on the internet regarding certain AMG models. This one missed it's oil change by 13000 miles and has small metal particles floating around in it . Not good but possibly not the end of the world, change the oil twice in quick succession maybe (flush) 🤷‍♂️
 
Upon agreeing to purchase my AMG C63 in February 2021 the dealer agreed to change the differential oil prior to collection as it appeared not to have been changed.It now transpires they changed the gearbox oil by mistake instead.They agreed to change the Diff oil recently and upon checking the oil (I got them to save a jar full) it looks pretty dirty and has fine particles of metal.

I read on the Forum the Limited Slip Differential (LSD) has metal plates which create the particles.The attached photo shows the oil but that is not proof of any issue so I am sending off a sample to Miller Oils UK lab for analysis. I will share the results Which hopefully will be OK.

It is a shame the dealers don’t bother with the running in diff oil change. Maybe that’s because it’s free to the customer !!!
I guess changing the gearbox oil is more expensive than changing the diff oil. Possibly something you can do yourself. It's a super easy job
 
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^^^ Changing the diff oil is a 'super easy job ?' Not necessarily . It would depend entirely on the OP's technical skills , available tools and the equipment to lift the car up while it remains level.

Granted , it's not the most taxing of jobs but it is one that has very serious consequences if not done properly.
 
I agree , it's shocking that this basic job has been missed . It is a subject that is discussed far too often on the internet regarding certain AMG models. This one missed it's oil change by 13000 miles and has small metal particles floating around in it . Not good but possibly not the end of the world, change the oil twice in quick succession maybe (flush) 🤷‍♂️
 
Thanks Pete ,
Miller Oils analysed the oil and recommended another change in a few thousand miles and check the condition then.Will see what MB have to say but recently Head Office want me to go back through the dealer on this question.
There are no doubt hundreds of cars running on similar poor oil but no one knows.
 
I had the diff oil changed again today by a local garage to keep my RAC warranty valid, rather than me doing it.The oil is dark and not much different to the 16,000 mile service, also dark with very very fine grey particles. (Now at 21,000).I may get it analysed but at the moment my conclusion is get your limited slip diff done every 5,000 miles as it has a hard life.Castrol do an oil of the right spec at about £36 per litre.It takes about 1.5 litres.
 

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I had the diff oil changed again today by a local garage to keep my RAC warranty valid, rather than me doing it.The oil is dark and not much different to the 16,000 mile service, also dark with very very fine grey particles. (Now at 21,000).I may get it analysed but at the moment my conclusion is get your limited slip diff done every 5,000 miles as it has a hard life.Castrol do an oil of the right spec at about £36 per litre.It takes about 1.5 litres.
This is cheaper
 

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