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Hello guys,

2012 BMW X5 Diesel at 86000 miles

When I accelerate, about 40 mph, I feel motor knocking and/or rough shifts all the time. I think it’s the time to service the transmission. Can anyone share what would be the best transmission oil to go with and is there any kind of DYI video around?

Thanks
 

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Zf lifeguard 6 or Mercon SP... Identical oe fluids.
 

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Use Mercon SP its identical to ZF Lifeguard 6 (both made by shell) and about $6 a quart. Transmission holds about 10-11 quarts so get a full case to exchange the fluid 100%. Get a ZF pan also not too expensive online <$100. Need to cut some length off of a torex bit (forgot size) to get to the rear 4 transmission pan bolts due to cross member. Not a bad job there is a very detailed write up about it on the web. I did mine last summer at 95k and it shifts amazing not that it shifted poorly before though. ZF recommends 60k intervals on the hp26 transmission which is in many other cars as well. Do the transfer case too while your under there. It takes an allen hex adapter for jeeps about $15 online and less than a quart of ravenol fluid about $30 online too. Hope this helps!
 

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Anyone wanna suggest he replace any seals?

Maybe opine as to the odds of transmission fluid not fixing his issue?? (OP, that description is really rather lacking, no?)

But there are some fine DIYs here and on xoutpost on trans fluid changes....easy enough to search for and find.
 

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Use Mercon SP its identical to ZF Lifeguard 6 (both made by shell) and about $6 a quart. Transmission holds about 10-11 quarts so get a full case to exchange the fluid 100%. Get a ZF pan also not too expensive online <$100. Need to cut some length off of a torex bit (forgot size) to get to the rear 4 transmission pan bolts due to cross member. Not a bad job there is a very detailed write up about it on the web. I did mine last summer at 95k and it shifts amazing not that it shifted poorly before though. ZF recommends 60k intervals on the hp26 transmission which is in many other cars as well. Do the transfer case too while your under there. It takes an allen hex adapter for jeeps about $15 online and less than a quart of ravenol fluid about $30 online too. Hope this helps!


I think ZF fluid is made by either Fuchs or Pentosin (before Fuchs bought them).


Sent from my iPhone using Tapatalk
 

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If the problem actually is the transmission, new fluids will almost certainly not fix the issue...

Assuming the issue is actually due to a faulty transmission: At best, replacing all of the seals will get things working properly again (about $250 for parts). At a lot less better, you have worn out solenoids that need to be replaced (About $350 for just the solenoids, in addition to the $250 for the seals, filter, new oil). At worst, you have a worn out / clogged up valve body (About $2K for a ZF rebuilt unit). At far worst, you have a worn out bushing that keeps pressure for the E-clutch (ie transmission rebuild $$$)...

I would get the codes scanned by a competent shop (emphasis on "Competent"...)... Stumbling / misfiring engine is not something that a bad transmission will cause; however, a stumbling / misfiring engine can cause issues w/ how the transmission behaves...
 

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^ Great advice.

Do keep in mind that BMW does not train any mechanics on anything related to opening a transmission. If they get ANY tranny code, the solution is 'replace trans'. Hence, going to a dealer OR going to a "BMW shop" will usually be a bad move for actual transmission issues.

Not sure yours is...yet
 

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Hello guys,

2012 BMW X5 Diesel at 86000 miles

When I accelerate, about 40 mph, I feel motor knocking and/or rough shifts all the time. I think it’s the time to service the transmission. Can anyone share what would be the best transmission oil to go with and is there any kind of DYI video around?

Thanks
As others have rightfully pointed out, it appears you have a bigger issue that a fluid change is unlikely to fix.

First get a code reader to make sure this isn't symptomatic of some bigger issue. That's an invaluable tool regardless. Going to your mechanic with some knowledge is much better that going in ignorant.

http://www.realoem.com/bmw/enUS/showparts?id=ZW03-USA-11-2012-E70N-BMW-X5_35dX&diagId=24_1372

http://www.realoem.com/bmw/enUS/showparts?id=ZW03-USA-11-2012-E70N-BMW-X5_35dX&diagId=24_1014

http://www.realoem.com/bmw/enUS/showparts?id=ZW03-USA-11-2012-E70N-BMW-X5_35dX&diagId=24_1071

https://www.youtube.com/watch?v=ZRrgmfM8VlQ

https://www.youtube.com/watch?v=2g-5uY_P7uA

https://www.youtube.com/watch?v=KoIRHWDUSNU

https://www.thectsc.com/products/solenoid-kit-6hp19/26/32-e-shift-35-115.html

https://www.thectsc.com/products/sealing-sleeve-kit-6hp26/28/32-214-50.html

Make sure you contact thectsc to make sure you're getting the right parts.

Note there is a specific filling procedure for this tranny and replacing these parts will require you to reset transmission adaptation.

Oh one more thing. Make sure both your engine and transmission thermostats are getting up to proper operating temp. I've replaced both of mine,

All this info was, at some point, brought up by other members on this forum.

Please share you results on this forum. That's what makes this forum is so invaluable.
 

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Discussion Starter #14
As others have rightfully pointed out, it appears you have a bigger issue that a fluid change is unlikely to fix.

First get a code reader to make sure this isn't symptomatic of some bigger issue. That's an invaluable tool regardless. Going to your mechanic with some knowledge is much better that going in ignorant.

http://www.realoem.com/bmw/enUS/showparts?id=ZW03-USA-11-2012-E70N-BMW-X5_35dX&diagId=24_1372

http://www.realoem.com/bmw/enUS/showparts?id=ZW03-USA-11-2012-E70N-BMW-X5_35dX&diagId=24_1014

http://www.realoem.com/bmw/enUS/showparts?id=ZW03-USA-11-2012-E70N-BMW-X5_35dX&diagId=24_1071

https://www.youtube.com/watch?v=ZRrgmfM8VlQ

https://www.youtube.com/watch?v=2g-5uY_P7uA

https://www.youtube.com/watch?v=KoIRHWDUSNU

https://www.thectsc.com/products/solenoid-kit-6hp19/26/32-e-shift-35-115.html

https://www.thectsc.com/products/sealing-sleeve-kit-6hp26/28/32-214-50.html

Make sure you contact thectsc to make sure you're getting the right parts.

Note there is a specific filling procedure for this tranny and replacing these parts will require you to reset transmission adaptation.

Oh one more thing. Make sure both your engine and transmission thermostats are getting up to proper operating temp. I've replaced both of mine,

All this info was, at some point, brought up by other members on this forum.

Please share you results on this forum. That's what makes this forum is so invaluable.
Use Mercon SP its identical to ZF Lifeguard 6 (both made by shell) and about $6 a quart. Transmission holds about 10-11 quarts so get a full case to exchange the fluid 100%. Get a ZF pan also not too expensive online <$100. Need to cut some length off of a torex bit (forgot size) to get to the rear 4 transmission pan bolts due to cross member. Not a bad job there is a very detailed write up about it on the web. I did mine last summer at 95k and it shifts amazing not that it shifted poorly before though. ZF recommends 60k intervals on the hp26 transmission which is in many other cars as well. Do the transfer case too while your under there. It takes an allen hex adapter for jeeps about $15 online and less than a quart of ravenol fluid about $30 online too. Hope this helps!
I think ZF fluid is made by either Fuchs or Pentosin (before Fuchs bought them).


Sent from my iPhone using Tapatalk
Do I reall need 11 quarts?

Thanks for all the info
 

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Discussion Starter #16
^ Great advice.

Do keep in mind that BMW does not train any mechanics on anything related to opening a transmission. If they get ANY tranny code, the solution is 'replace trans'. Hence, going to a dealer OR going to a "BMW shop" will usually be a bad move for actual transmission issues.

Not sure yours is...yet
About 40 mph, the tranny experience a hard shift when I hit the gas but if I press the pedal gradually I don’t feel the shift. It just happens at 40 mph ( gear 4/5) :dunno:

I am new to diy and x5s
 

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You only get a portion of the fluid out with every drain. 6-7 liters is what I would get and I believe that is what the kits come with.
 

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I forget how many qts, check fcpeuro kits for the trans change it'll give you how much to get, but get an extra L in case.
 
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