As problems with these seem to come up fairly often, here's some advice from the motoring writer n the Telegraph:
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Is there any way to avoid dual mass flywheel problems, other than by not buying a diesel? Are they affected by driving style or maintenance? I have a 2006 Ford Focus 2.0 TDCi and wonder whether I'm on borrowed time.
JD, Hanwell
Don't let the clutch out when you're in gear and the engine is idling – always apply some revs. Also, try to double declutch smoothly up and down the box. That's the advice offered by readers whose DMFs have lasted for 200,000 miles.
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Hope this helps someone. If you don't want to learn to double declutch, at least try to match engine revs with road speed when you change gear.
Vin