irokdastar

Hello everyone . So I want to do a transmission flush and change the diffuser oil. Does any aftermarket company make oils for both ? Benz wants an arm and 2 legs for the trans oil . Is there a cretin mobile 1 or any other brand that's works ? Thanks

gixxerboy

i wouldnt flush it, you can find the benz fluid online cheaper than the dealer.

diffuser oil?

irokdastar

sorry mt phone spell check is weird , i meant rear the oil for the rear differential . can i use mobile 1 and what viscosity- weight do i need ? How about shell atf 134 . i read that its made for out transmission . Thanks for the help.

Rudeney

Shell ATF-134 is good for the transmission. It is usually easily obtained, at least in the USA, for about $7/quart when purchased by the case (dozen). If you can't find it, check with your local Shell oil supplier (the company that supplies Shell gasoline to your local station).

irokdastar

I found it on ebay . If i am looking at flushing the system how many qt. do i need ? Also does anyone know about the rear diff oil ?

gixxerboy

this is the transmission fluid i use at my shop for our cars

https://www.bgprod.com/catalog/trans...synthetic-atf/

Rudeney

Here's the flush procedure:

http://benzbits.com/722_6/TransmissionFlush.pdf

Following this, and assuming your system isn't low on fluid, this require 9 liters. Now, if you drop the pan and change the filter, you'll need about 5 liters to refill from that. So, in total about 14 liters.

irokdastar

gixxer you said dont flush it . can you tell me why ?

gixxerboy

i run a transmission shop. I dont think hooking it to a flush machine is good for the transmission. I've seen issues after a flush that werent there previously. I will never flush one of my cars.

gixxerboy

i just read Rudeney procedures, doing that is fine, i dont consider that a "flush" There are flush machines you hook them up to, that is not what i would use

xsever

For the rear differential, I used the following which I bought from eBay for $38.

Mercedes 1 Liter Differential Oil (Hypoid Oil) SAE 75W-85 NEW 001989170310

mis3

In the topic of differential oil, how often should this be changed?

I own my 2004 CLK 320 for 12 years now and I don't think I ever changed this oil. Is this a complicated job for a w209?

Rudeney

That procedure I posted is MBZ's WIS doc for flushing fluid. It's meant to get the fluid out of the torque converter on units that do not have a drain. Sometime around MY1999/MY2000, the torque converter drain was deleted from the 722.6 transmission. It was re-introduced with the 722.9 transmission. With the torque converter drain, it is preferable to do a full fluid change using it. Without it, then do the "flush" as indicated in WIS.

xsever

I remember reading a lot of threads about this before changing mine and there were a lot of opinions in the absence of any mention from MB about a change interval for differential oil.

I went with the logic that the fluid is 10 years old and the fact that I saw, online and on a friend's car, the state of the old fluid.

When I changed the fluid on my car, it really came out in a visually bad shape and for $38, it's a really good insurance policy and a source of peace of mind.

mis3

How much time did you take to change the fluid? I am not a DIY person but I do jab an local indie which I go. He is a Sprinter specialist and he was the one who did my tranmsiation pan flush.

I am curious. Are the any symptoms if bad fluid? Would one notice any difference in the ride after the change?

xsever

Less than an hour from start to finish. The hardest part is finding a small enough hose and pump to suction the fluid from the differential because the nut is not at the bottom of the differential but on its side. So you need something to suction the fluid out sideways.

Are there any bad symptoms? No not really. I never felt anything odd with the differential, but the thought of a fluid being there for 10 years did not sit right with me and I saw that many people on the forum did change it so I followed suit.

I did NOT notice any difference in the ride after the change.

Nektopoli

Doing the rear diff fluid on my 2007 C280 4matic tomorrow morning, using this;


Got all the tools, going to get everything together tonight, might even drain it tonight and fill it in the morning.

Going to do the front diff on Monday it's a little more involved because the fluid has to be sucked out of the fill hole.

NP

animal1488

changed my fluid n filter on my 2001 clk320 convertible and now my tranny slips has this happened to anyone else?

Rudeney

What fluid did you use? And did you buy a dipstick to check the level at the indcated temperature?

Jma77i

NO! it shouldnt slip..
#1 you need a dip stick to get the accurate reading of the oil level.
and it needs to be when the car is at exactly 80 degrees.
Also, often when you use the dip stick it wont go all the way to the bottom without some force and people think its under filled if they didnt bottom it out before pulling it up to take the reading..

#2 what interval did you have it changed before do you know the cars history? if its the first change it could be trouble (sealed for life was what w208 clk owners manuals suggested up until 2008-09)

#3 .....another problem could be if you went to a flush shop that uses a machine to vacuum pump out the transmission with pressure into the system. what kind of ATF did you use?

#4 MY EXPERIENCE i replaced some of my transmission oil again because i dont know the exact history, and at first by idling my car up to 80 degrees i thought i had it filled in spec... but once i left for a drive i forgot my wallet so i went back right away and decided to double check... once it heated up from driving i noticed it had been over filled... i took some oil out and check again with engine being cooled to 80 exactly... when i left again i felt the difference in shifting was was smoother.... be super careful !!!