S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Question about 722.631 5G transmission

Old Sep 16, 2011 | 11:42 PM
  #1  
nathandimond's Avatar
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2006 Volvo S40 T5 AWD 6spd
Question about 722.631 5G transmission

Hello, I have been researching for weeks trying to decide which Benz to buy. I narrowed it down to the C43, W202 C280, and W140 S420 or S500. I have decided not to buy the C43 due to the above average transmission failure I see mentioned so often. Had it not been for this issue, I would have no problem buying a C43. What I found interesting about this issue, and also confusing, is that the 722.631 transmission used in the C43 is also used in the late model W140 sedans; yet I don't see very many posts about transmission failure in this forum. So my questions are:

Is the transmission failure as common in the W140s as it is W202 C43 or is it more reliable and durable on the S-class? What's the difference?

Is this the same transmission found in a 2000MY C280? If not, does anyone know that specific tranny code?
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Old Sep 17, 2011 | 06:48 AM
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oldsinner111's Avatar
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s320
There were failures when factory said it was lubed for life.Then they changed their minds and changed fluid and filter.
This is all I have seen.
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Old Sep 17, 2011 | 11:03 AM
  #3  
nathandimond's Avatar
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2006 Volvo S40 T5 AWD 6spd
So if the trans fluid hasn't been changed in 100k miles, how long can I expect it to last before it fails?

Would most W140 owners have known to have it serviced regularly?
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Old Sep 17, 2011 | 12:29 PM
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s320
I saw problems on different forums at 120,000 to 160,000

Last edited by oldsinner111; Sep 17, 2011 at 01:42 PM.
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Old Oct 24, 2011 | 01:30 AM
  #5  
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2000 S 500 MERCEDES BNZ
THEY ALL HAVE THE SAME 7.226 TRANSMISSION.THEY PRETTY MUCH EXPLODE INTERNALLY!!
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Old Oct 24, 2011 | 10:07 PM
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From: Toronto, Canada
99 C43 ///AMG
Originally Posted by oldsinner111
There were failures when factory said it was lubed for life.Then they changed their minds and changed fluid and filter.
This is all I have seen.
This is correct and I have both a C43 and a W140 with the 722.6. Its all about fluid, fluid, fluid. From what I hear the C43 does have a higher failure rate, but if you find one of these rare commodities, and it shifts perfect I wouldnt hesitate. FUN CAR!
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