2006 Caddy 1.9 TDi DSG 97000kms. I have just had my DMF replaced due to a sqeeking sound when starting and stopping.
The cost in total was AUD$2840.20. The DMF sits between the engine and the gearbox and helps remove vibrations due to engine pulsing, rapid acceleration overloading the gearbox/drivetrain.
Google 'DMF failure" and check out the videos, you may put your vehicle make or model in front of the 'Dmf failure" to get a more specific result. NOW some web research shows that this is quite a common problem to any manufacturer with smaller 4 cylinder deisels and some turbo petrol engines also and they are supplied as OEM by usually two Makers LuK and Sachs.

1. I bought the Caddy for longevity and fuel consumption. The extra cost of the diesel and the DMF repair bill has negated
this benefit. Next vehicle could be a non turbo petrol manual or slush box(conventional auto).
2. It appears my DMF problem may be a bit rare in Oz as most miles are usually longer distant trips because of our
geographic situation. Most of my miles have been city/urban start/stop.