KalC240

I found the MB 235.7 FE on ebay, but the part # was different than the A001 989 33 03, so I am confused.

Has anyone checked with the local dealers to see if they sell it by the bottle? $$?

mrobinso

I think I posted the following in the active thread about transmission fluid accidentally, read on:

Changing the differential fluid (which is the fluid in question here) is always a bit scary. Think about it, you are draining the pumpkin in the back of your car that houses some of the most, if not the most, sensitive gearing componentry in your entire vehicle, and refilling it, closing it up, and crossing your fingers it continues to work! I changed my transmission fluid a month ago with MB branded 85w-90 hypoid gear oil 1.55 L. Cost me $64 to buy the fluid and $10 for a liquid pump at Advance Auto Parts, but I have had smooth sailing/no changes since the fluid swap, which, in my mind, is a very good thing!

Quoting maverik's below post, I would recommend buying MB spec 85w-90.

I purchased it from Autohausaz here: http://www.autohausaz.com/search/pro...ber=0005830904

Cheers!

e24kgold

How often should the diff fluid be changed in an 05 c230 ?

Glyn M Ruck

Every 100K miles is fine.

vert

How much differential fluid do I need for a 2003 C320? I am about to order "Mercedes Hypoid Differential Oil; SAE 85 W-90; 1 Liter" from autohausaz.com and need to know if 1 bottle is enough or I need more than 1 liter bottle.

C230 Sport Coup

Glyn,
When it came time for me to do my diff, I couldn't find any of the approved oils, and the dealer didn't even carry the approved stuff.
I spoke to the service manager who said pretty much just pick any GL5 75-90 oil like the
Catrol Hypoy C and it would be fine.
So thats what I used.
I am tempting fate?

http://www.lubricants.com/BuyersGuid...OYCGearOil.php

phister

Redline has a 75W-85
http://www.redlineoil.com/product.aspx?pid=40&pcid=4

Glyn M Ruck

Guys - You know I like sticking to Benz approved products. All their new approvals are "clean gear" synthetics.

That said the diff is the least critical lubrication area of the car as long as you go minimum GL5 although Benz only likes one Lubrizol additive system.

If you can't get the genuine stuff I would go for a synthetic 75W/85 like the Redline.

If you ever develop a whine don't blame me because we are talking about untested products.

phister

Yea that's the only problem with these products. But I have friends that Autocross and race their cars and use redline and it hasn't failed them yet.

maverik259

Redline also has a 75-90 so if the dealer said any 75-90 I'd go with that...why did you pick the 85 over the 90 out of curiosity?

Glyn M Ruck

Benz specifies 75W-85

BF_JC230

Going thru the Spec Sheet and what I could find at the time...this is what I put in our 2005 w203 C230 @65,000 miles...

MTX Transmission = 001-989-26-03-10
Differential = 001-989-17-03-10 85w-90 (Spec 235.7)
Power Steering = BQ-1-32-0001

Hope this helps...
(G-Class, 463) is the ONLY Non-AMG with Spec 235.0

KalC240

I ended up using Mobil 1 LS 75W-90 based on this study..

http://www.synthetic-oil-tech.com/Gear%20Lube%20White%20Paper.pdf

samaritrey

I got my rear diff fluid from rmeuropean like all my other parts lol
Genuine all the way

vert

Do you need to buy two bottles (2 liters) to fill the diff on the c320?

LILBENZ230

Yes because the capacity is just more than 1L

Javvy

you need 2 bottles and also a small maunal syringe type tool to be able to inject the fluid into the differential chamber. Make sure that you open the fill plug first and then the drain plug....cause if the fill plug is jammed or for some reason you are not able to open it and you have alreday drained the fluid then you will be stuck big time.....just an FYI.....good luck.....I am waiting for the weather to get a little bit better so I can accomplish this........getting the car on those portable ramps in reverser will help in this task.....

javvy

vert

Thanks! Picked up 2 bottles of MB stuff from autohausaz. Not cheap at $57 for both, but peace of mind is worth it at least to me.

neurodave

I just did my diff fluid about 2-3 weeks ago with Mobil1 75W-90, and so far so good. No issues I can speak of. Can I be at peace with this or should I change it? I have a few posts about "DON'T DO IT" and many others who say it's fine.

Glyn M Ruck

You can be at peace.

C230 Sport Coup

What I've come to realize is that the diffs and transfer cases use standard bearings, packed with standard grease, so it's not quite such a big deal like with tranny fluid etc.

neurodave

Why did I post that here? Oops! wrong place. Ignore. Nothing to see here.

Wodeshed

The only 14mm male hex I could get my hands on is part of a set for $35, so I'm compromising on the gear oil with the Mobil 1 synthetic 75w-90. At my high mileage, I'm thinking it wont make much of a difference and it's certainly better than NOT changing it out. If I get a little whine I'll turn up the stereo.

VVF

I see one at $11 at HomeDepot