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E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm}


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Old Sat, Mar-19-2011, 02:37:27 PM   #1
Voodooking
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Default How Reliable are M DCT Transmissions?

I'm coming from a Manual E46 M3, looking at DCT E90 M3's, and SMG E60 M5's.

One problem that I've noticed with the SMG III in the M5's is that the clutch wears out in a relatively short space of time. For example 30k to 40k miles seems to be average.

Replacement seems to cost an arm and a leg, and the flywheel, release bearings etc. must be replaced at the same time, which can cost approx 2000 which isn't covered by warranty.

My question is, is clutch replacement going to be necessary on an E90 M3 DCT also? I realise that they are a completely different transmission made from completely different technology, but will I need to budget for replacing the clutches in the DCT also, or is it not something I even need to think about?
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Old Sat, Mar-19-2011, 07:41:37 PM   #2
silver-or-blue
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Default Re: How Reliable are M DCT Transmissions?

The M-DCT's seem to be very reliable so far, but I don't think there are a lot of high mileage ones. If you want to see the insides of one that's been severely abused, look at Sticky's transmission mod thread in the S65 forum on another site. My guess is that as long as you don't abuse the clutches by driving your car like an automatic (throttle depressed/brakes applied or holding the car with the throttle on a slope) very often or use launch control frequently, it will live a long time provided it doesn't have a manufacturing fault.

Cleveland address the reliability question very well in this thread: http://www.m3forum.net/m3forum/showthread.php?t=356951
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Old Mon, Mar-26-2018, 12:54:35 AM   #3
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Default Re: How Reliable are M DCT Transmissions?

Didn’t want to start a new thread.

Now that this platform has been out for sometime, can anyone else chime in?
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Old Mon, Mar-26-2018, 11:33:01 AM   #4
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Default Re: How Reliable are M DCT Transmissions?

The best E9xM3 tech is at m3post dot com in the E9xM3 section. They seem very reliable but some have leaked and some have needed a pump and some modified supercharged ones have needed better clutches. I would not hesitate to buy one — it’s s great trans that shifts faster than any human.
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Old Mon, Mar-26-2018, 11:47:09 AM   #5
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Default Re: How Reliable are M DCT Transmissions?

Thanks for the insight. I didn’t know about the pumps but I figured that they do seem reliable from the limited reading I’ve done. It’s too bad this forum doesn’t have as much active speak on the car. I prefer it’s layout to the m3post.
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Old Mon, Apr-30-2018, 11:48:40 PM   #6
WyattH
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Default Re: How Reliable are M DCT Transmissions?

The seals are prone to leaking, but the mechanics actually seem pretty robust.
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Old Mon, May-28-2018, 10:16:11 PM   #7
amuse
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Default Re: How Reliable are M DCT Transmissions?

Other than the typical leaks, nothing really.
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Old Wed, Jun-13-2018, 07:32:11 AM   #8
marlenjsharpton
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Default Re: How Reliable are M DCT Transmissions?

While fueling the need for cars with more horsepower, BMW's M-division seems to ... that the days are numbered for manual and DCT gearboxes.
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Old Thu, Jun-14-2018, 01:14:40 AM   #9
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Default Re: How Reliable are M DCT Transmissions?

Other than the oily residual all over the pan, I've flogged my car lots of times. I just had Blackstone check it out.
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Old Sun, Jul-08-2018, 03:43:27 AM   #10
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Default Re: How Reliable are M DCT Transmissions?

One issue is some bolts on the mechatronics unit get loose and start leaking. It's tight in there. Some have said you need to drop the trans to get to those bolts. I think you can get to it if you make a stubby T30 socket and lower the trans a little. Or use some sort of flex head socket.

Otherwise, its been reliable for me. Only issue I had was the trans shifted jerky when I replaced the fluid with redline DCTF. Went back to OE pentosin and its been smooth since.
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Discussing How Reliable are M DCT Transmissions? in the E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) Forum - {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm} at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)