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A45s Rear Diff Noises, Oil and Oil Changes

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59K views 268 replies 12 participants last post by  veeeight  
So I need to try 😊
Might be one ridiculously expensive attempt if you get it wrong, or the oil you're attempting to use does not work the way it should, I hope you fully understand that.

According to your driving style, track or Violent driving in advancevice versa
Are you abusing your car and because of that, dealer will not accept to service it?
 
@veeeight Could you please take under two seconds and find me the oil number for both our diff and gearbox? And gearbox filter. I need the OEM codes, i.e. I think gearbox oil is 236.21 but haven't been able to determine whether it's for the 8 or the 7-speed DCT. Anyways, if you have all three codes I'd really appreciate. And is it true there's no diff filter? Does it come without a filter or we just never change it?
 
And if it wasn’t for this forum I wouldn’t have realised.
If it wasn't for this forum, come May I would've taken it in and they would've said that almost everything I needed for the service was out of stock. And I'd be on my way home, very pissed. I'm pissed now, but at least I feel a little better knowing I have saved myself a little time, having placed my order in advance. But I wonder if joining a forum is a prerequisite for owning this vehicle. :unsure:

According to my list:

Rear Diff:
Gear set - M-B 235.63 - not in service schedule, "lubed for life" 😂
Coupling - M-B 235.64 - A0009894406
No diff filter. Left and Right coupling separate fills.



Gearbox (I'm not 100% sure of the parts below, so check with your dealer):
Filter - A2463772300
O Ring - A0229978045
ATF - M-B 236.22 - A0009896104
Much appreciated!
 
Ok so I picked up 6lt of ATF - M-B 236.22 - A000989610409 and I was told it takes up 5.something.

Now on to the diff left and right section oil, DCT filter etc, and plugs... and let the wait begin (hope not).
 
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They behave differently for sure. Our cars are a lot more rear-biased, to the point of becoming scary on worn tires (Race mode, ESP-sport). But it's so satisfying to be able to break traction so easily, exiting roundabouts and u-turns being my favorite spots and you don't need drift mode either, Race mode will do. Needless to say people are often impressed seeing a hatchback do that. And we get that with only a 50% to the rear, that's even more impressive.
 
The question is, would it be best to stick to "lubed for life" but having the advantage of running the MB spec oil, or go VAG for the sake of running fresh oil, but not knowing if the VAG spec will work 100%?
 
I'll drop by my dealer once more and ask if they know anything about the hypoid. I could bring them the oil no problem, the real problem is letting them work on something they aren't trained for and with no procedure to follow.
 
I'll drop by my dealer once more and ask if they know anything about the hypoid. I could bring them the oil no problem, the real problem is letting them work on something they aren't trained for and with no procedure to follow.
 
Picked up a few things that arrived recently, don't really know when, I didn't get a call as I explicitly requested. Perhaps they didn't think I needed it, as I ought to have upgraded myself to the 6th sense. So I called them instead.



The little box is listed as the oil cooler filter and the bigger ones as oil filters.
The little o-ring on the left is listed as an o-ring seal (profile) and the bigger ones as o-rings.

And now we come to what really worries me, the diff oil. As you can see they gave me the 235.15 approval which, as I've been reading here, is not the right one for our twin clutch system. I looked in the bag just to make sure, and I immediately asked why it's not the 235.64 which is the right one based on what I've read. They went like "where did you find that info" typical dealership response like I'm some dumbass clueless rich dude owning a six figure car, not supposed to worry about anything going into the engine and other components, and I said "from owners in the UK, that's the one they use". Guy said, "so that's what they use in the UK, it's country-specific". I said, so how come we use the same engine oil 0W-20, no matter if I have personally decided to stick to the AMG 0W-40 as I would use the 20 to boil my spaghetti in our blazing hot summer, the 0W-20 is still the recommended one, which is the same in both countries. So same engine oil but we use different diff oil? doesn't make much sense. He said he would run another check based on my VIN, but I don't think that is going to change anything as all orders are based on VIN in the first place. Perfect...

I have sent MB an inquiry, asking which is the right diff oil approval for my car and in my region.
Waiting for their response.
 
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@veeeight so the 235.15 that they gave me is for the single clutch differential systems, not suitable for our twin unit.
 
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It's not ideal the situation we collectively find ourselves in around this lubricant situation. I'm guessing from @fatty45, response to my diff oil MB used, it is not necessarily exactly correct but it's not possible to tell for sure but it's generically possible it is correct.

I would be interested in @Turbo Ed experience on this in Australia. Or have I missed it in the size of the post :)
I can tell you one thing. I never, ever ran into a single problem in my VW, everything was in stock, down to the tiniest consumable, at every dealership or the aftermarket. I knew every little thing going into the engine and everywhere else and this paranoia that I'm going through right now, dealership ordering by my VIN and yet selling me the incorrect oil, was just never a thing. Or waiting for four fucking plugs like it's some kind of rare sh1t developed in some secret government facility 500 feet underground. Had tons of options.

The A45s is such a thrill, it really is incredible, but for my next car I think I'm going back home. Probably in the form of an Audi though.
 
I have given up trying to second guess why dealers give out the parts/lubes they do! No idea why they thought 235.15 was correct for your car. Unless they have an instruction that says substitution is OK…….
Many thanks for your help. I have sent MB an inquiry, waiting for their response. You know, dealing with extremely difficult situations such as this, changing oils in your car, you have to double check and then triple check.
 
@Turbo Ed If I can't find the OEM 235.64, are there any aftermarket alternatives that you recommend? Don't mind the cost, what is the best 235.64 in your opinion?
 
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No aftermarket version of 235.64 in this country, to the best of my knowledge, which is precisely why my independent keeps buying it from the local MB Dealership.

In all my vehicles, this would be the first time I have had to do this in at least 40 years.
So if I can't find any aftermarket versions, and dealership can't get me the 235.64, I'll dump in the 235.15 which they claim is the correct oil and enjoy my rear differential for as long as it lasts. What else can I use, I can't pee in there can I?
 
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MB sent you the oil so you can always litigate against them if anything goes wrong. But I doubt it will. Same as mine, which may well have had the same substitute.
I hope you're right. And here's what I'm thinking...

If I understand it correctly, the .15 is the correct oil for the single clutch 4matic units, which means it's similar to the .64, it's not like it's entirely different. So I was thinking, since it's similar to the .64, meaning it doesn't have the required properties to cope with our highly demanding twin clutch differential, meaning there may be problems in the long run, perhaps changing it every year, as opposed to three years, will help maintain a degree of reliability similar to that of using .64 and changing it as per MB intervals.
 
It all makes perfect sense @fatty45 and joining this forum was the next best thing after purchasing my A45s (although I joined here a few months before picking it up). Who knows how in the world I would've been able to deal with all that mess that AMG has been putting us through. I certainly wouldn't have known a thing about our vehicle's tuning difficulties, so I would have probably jumped straight into tuning it to 500hp without knowing anything about WOT duration and ambient temperature limitations that @Turbo Ed has explained so nicely, and I wouldn't have known about our spark plugs and differential oil shortages, to at least place an order in advance. And I'm far from acquiring AI capabilities, but we're fortunate to have one here.

The thing is, it's out of my hands. I can't seem to be able to find the .64, OEM or aftermarket, and if dealer can't get it for me then either I'm not changing the oil at all (which ain't happening), or .15 it is. I don't think I have another choice here...

Oh, you guys care to know what MB responded? I asked which is the correct oil for my car, 235.15 or .64 and I wanted them to answer (expecting them to point the .64) so I would show my dealer the screenshot. And their response was that I need to contact my dealer. Who has sold me the .15.

And the paranoia goes on...
 
What I'm planning to do next is show my dealer a few pages that I've printed, as per @veeeight advice:


They may question the third source but certainly can't say a thing about MB's own pages.

Other than that, dunno what else I can do really. Set up my own lab and produce a .64?
 
What I'm planning to do next is show my dealer a few pages that I've printed, as per @veeeight advice:


They may question the third source but certainly can't say a thing about MB's own pages.

Other than that, dunno what else I can do really. Set up my own lab and produce a .64?
So I did... went to spare parts, I said any news on my orders, they said our system shows that you have the right oil , which is the 235.15. Two guys at the spare parts looking at me not saying a word while I was explaining that the .64 is the right oil for the twin clutch unit, as shown on the previous links, and especially those from MB themselves. Brought the printed pages with me and showed them. In the end all they replied was "so is the 235.64 the oil you want?" I said yes, and they said "we're ordering it for you". Frankly I don't give a flying **** if I have convinced them about the fact that the .15 is the wrong oil and that what this car needs is the .64, which they sure looked like they didn't care, the only thing I care is that they have ordered the .64. Other than that, it really is like talking to a brick wall.

And let the wait begin... once more.

Then I asked about the spark plugs, they said order is still pending, unknown ETA. I said this whole thing is ridiculous, you guys are unable to service my vehicle. They said it's not our fault and that I should speak to the main distributor, gave me a number. I also found out that they are now under new administration as they were recently acquired by another company, which is never a good thing when you're talking support. But what they said next was what made my blood boil. They said MB will not express ship any parts, including the plugs, unless the vehicle is VOR. Otherwise the parts are on backorder. So I said "so you're expecting for parts to fail before you service them, is that what you're telling me?", more or less yes.

Going to call the distributor, see what kind of BULLSHIT they have to say. Parts need to fail before you service them, what in the actual ****??!!