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#4682999 - 03/03/18 08:01 AM MB Spec 235.7 gear oil
Egg_Head Offline


Registered: 10/07/12
Posts: 284
Loc: 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?


Edited by Egg_Head (03/03/18 08:03 AM)
_________________________
1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)

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#4683018 - 03/03/18 08:33 AM Re: MB Spec 235.7 gear oil [Re: Egg_Head]
Audios Offline


Registered: 11/19/11
Posts: 888
Loc: 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
2005 BMW M3 BMW Twin Power 10/60
1998 BMW M3/4/5 Fuchs 5/40
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL

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#4683022 - 03/03/18 08:37 AM Re: MB Spec 235.7 gear oil [Re: Egg_Head]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: 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.

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#4683174 - 03/03/18 12:02 PM Re: MB Spec 235.7 gear oil [Re: Egg_Head]
Pelican Offline


Registered: 11/28/12
Posts: 151
Loc: 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.

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#4683253 - 03/03/18 02:08 PM Re: MB Spec 235.7 gear oil [Re: Egg_Head]
JEL01 Offline


Registered: 09/24/15
Posts: 117
Loc: 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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