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Discussion Starter · #1 ·
First time poster here, go easy!

So I’m looking at changing the transmission oil and filter on my CLA 220 AMG sport which is a 64 plate and diesel. The gearbox is a 722.9 7G automatic.

Any advice, instructions or videos that you guys could share? It seems pretty straight forward on some of the videos I’ve watched although they weren’t for the exact model.
Not sure exactly how to check the amount of fluid that’s in there and also how much and what type to fill it up with.

Mercedes want to charge £740 for service A and the trans oil and filter which is why I’m looking to do this myself. Along with all discs and pads and 4 potential new tyres it’s going to cost a fortune!

Thanks
 

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Discussion Starter · #3 ·
Ah okay. It’s just what I’ve been reading.
Is there a reason you think it might not be and any idea what it could be?
Thanks
 

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I believe C117s are mated to 724.x gearboxes
Enter your vin into datamb.com and that should shed some light on whats in your particular car
 

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Discussion Starter · #5 ·
jmc you were right :)
Entered the vin and it states the transmission is 724003.
Can you assist with anymore info?
Thanks again
 

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jmc you were right :)
Entered the vin and it states the transmission is 724003.
Can you assist with anymore info?
Thanks again
Actually yes ... run a search and you will find several posts on this gearbox oil change thing
Lots of info! Just one comment about the process -- keep things clean clean clean
 

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First time poster here, go easy!

So I’m looking at changing the transmission oil and filter on my CLA 220 AMG sport which is a 64 plate and diesel. The gearbox is a 722.9 7G automatic.

Any advice, instructions or videos that you guys could share? It seems pretty straight forward on some of the videos I’ve watched although they weren’t for the exact model.
Not sure exactly how to check the amount of fluid that’s in there and also how much and what type to fill it up with.

Mercedes want to charge £740 for service A and the trans oil and filter which is why I’m looking to do this myself. Along with all discs and pads and 4 potential new tyres it’s going to cost a fortune!

Thanks
First time poster here, go easy!

So I’m looking at changing the transmission oil and filter on my CLA 220 AMG sport which is a 64 plate and diesel. The gearbox is a 722.9 7G automatic.

Any advice, instructions or videos that you guys could share? It seems pretty straight forward on some of the videos I’ve watched although they weren’t for the exact model.
Not sure exactly how to check the amount of fluid that’s in there and also how much and what type to fill it up with.

Mercedes want to charge £740 for service A and the trans oil and filter which is why I’m looking to do this myself. Along with all discs and pads and 4 potential new tyres it’s going to cost a fortune!

Thanks
Hi how did you get on with the tranmition oil and filter change as I have the same car with 90k miles on it and has not been done yet any help would be greatly appreciated thanks..
 

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Do try search ... we posted a lot about this
Too much to repost here
 

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Discussion Starter · #9 ·
Hi how did you get on with the tranmition oil and filter change as I have the same car with 90k miles on it and has not been done yet any help would be greatly appreciated thanks..
Hi
I actually backed out of doing this myself in the end and put it into a Mercedes specialist.
Weighed it up several times and decided putting a niche job like this into a specialist would be far the easier option.
Pretty happy I did in the end as it had two leaks after which they fixed for free.
They did mention that sometimes changing the gasket can be more hassle than it’s worth as it won’t sit properly afterwards which can create small leak
 

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... tightening sequence and torque ramp ... its an aluminum framed gasket
 

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Hi
I actually backed out of doing this myself in the end and put it into a Mercedes specialist.
Weighed it up several times and decided putting a niche job like this into a specialist would be far the easier option.
Pretty happy I did in the end as it had two leaks after which they fixed for free.
They did mention that sometimes changing the gasket can be more hassle than it’s worth as it won’t sit properly afterwards which can create small leak
Very wise.

there are DIY stuff and there are things you really should get someone who knows what they are doing to do it for you.
The auto trans is one of them. It is not the same as changing out the engine oil and filter.
 
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I ask my local mechanic shop to check if they can do an oil and filter change.

They have 5 "procedures" for a CLA45, but none was listed for my VIN... :(
 

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They can't find the right procedure for my specific car.

I will have to go to the dealer if i want to do it... :(
 

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Oh ... that

Well the synopsis:
  • break dip stick cap (will need new)
  • drain (and note volume)
< keep things clean from here >
  • yank off the gearbox cover
  • replace filter
  • same for oil cooler
  • new cover gasket (aluminum frame w/seal)
  • new cooler filter/seals
  • refill (thru paint filter) with similar volume a little less
  • add antifoam additive (its a 45)
  • start and warm gearbox to 40c
  • check level w/ benz dipstick head (amazon)
  • check level 3x to be sure of reading
  • slowly add to 40c marking
  • optional repeat at 70c
  • use new dipstick cap and tag with white (i think?) paint dot to note antifoam added

Think i posted the dipstick markings a while back

Nice thing is 45 has gearbox temp in cluster

Bit of a headache as temp point and marker reading tolerances are tight (you know the germans)

Contamination can screw up the internal channels etc so lint free cloths, clean work pan for parts, bla bla bla
 

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I know, but i (and the shop) don't really want to mess with that if they don't have the right procedure to do it.

Maybe that is why some have do it for 400$ and some other at 1200$...
 

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aint for the faint of heart but doable with patience
tough part is getting running level correct at either (or both) temp points
there is (barely) enough room to fashion a thermocouple connection inside the hollow dipstick (spring) body and embed the wires into the polymer reticle tip
that will give real time temp data and since its less than 120c most mini t/c bead heads will do fine (those wires are only like 250um and the weld bead can be trimmed down to fit)
 
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