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MB Spec 235.7 gear oil #4682999
03/03/18 08:01 AM
03/03/18 08:01 AM
Joined: Oct 2012
Posts: 339
North Carolina
Egg_Head Offline OP
Egg_Head  Offline OP
Joined: Oct 2012
Posts: 339
North Carolina
Helping my neighbor this weekend with his 2006 C350. One thing on the list is rear diff gear oil change. Will the world stop spinning and the rear end drop out if we use Castrol Syntrax LS 75W-90 which he has in his stash or do we need to get a spec'd 235.7 oil which would mean from the dealership today? I see the 235.7 is 75W-85, is this for better fuel economy?

Last edited by Egg_Head; 03/03/18 08:03 AM.

1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)
2011 MB E350 4Matic wagon
1979 CJ-7
Re: MB Spec 235.7 gear oil [Re: Egg_Head] #4683018
03/03/18 08:33 AM
03/03/18 08:33 AM
Joined: Nov 2011
Posts: 1,242
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,242
Lyndhurst NJ
Get the right stuff, only thing my parts program is approving is Redline 75/85 GL-5 or OEM fluid at 38$ each. It only takes one liter so best to play it safe and just get the right stuff in there.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: MB Spec 235.7 gear oil [Re: Egg_Head] #4683022
03/03/18 08:37 AM
03/03/18 08:37 AM
Joined: Sep 2015
Posts: 2,477
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,477
Malaysia
Originally Posted By: Egg_Head
Helping my neighbor this weekend with his 2006 C350. One thing on the list is rear diff gear oil change. Will the world stop spinning and the rear end drop out if we use Castrol Syntrax LS 75W-90 which he has in his stash or do we need to get a spec'd 235.7 oil which would mean from the dealership today? I see the 235.7 is 75W-85, is this for better fuel economy?

The 75W90 in the stash is good to go.

Re: MB Spec 235.7 gear oil [Re: Egg_Head] #4683174
03/03/18 12:02 PM
03/03/18 12:02 PM
Joined: Nov 2012
Posts: 414
Ajax,Ontario, Canada
Pelican Offline
Pelican  Offline
Joined: Nov 2012
Posts: 414
Ajax,Ontario, Canada
Originally Posted By: Egg_Head
Helping my neighbor this weekend with his 2006 C350. One thing on the list is rear diff gear oil change. Will the world stop spinning and the rear end drop out if we use Castrol Syntrax LS 75W-90 which he has in his stash or do we need to get a spec'd 235.7 oil which would mean from the dealership today? I see the 235.7 is 75W-85, is this for better fuel economy?


Compare the cost of the lubricant vs the cost of a rear end, then you can decide whether to gamble.

Re: MB Spec 235.7 gear oil [Re: Egg_Head] #4683253
03/03/18 02:08 PM
03/03/18 02:08 PM
Joined: Sep 2015
Posts: 142
Rainville, USA
JEL01 Offline
JEL01  Offline
Joined: Sep 2015
Posts: 142
Rainville, USA
Use the approved stuff from the BEVO site, there are plenty of places to get the OE-approved stuff. There have been reports on the various forums over the years, sporadically, of people developing gear whines when not using the approved stuff. You may be fine, but I'd rather not test it.

In the CLK I only use 235.0 85w90 gear oil, every 50k so it's a minimal expense.

https://bevo.mercedes-benz.com/bevolisten/235.7_en.html


Cars I maintain:
02 MB CLK430-Edge 0w40
05 Honda Accord V6-Maxlife 5w30
13 Lexus RX350 AWD-M1 AFE 0w20
02 Toyota Tundra 4x4 M1 5w30

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