Lately, my friend have this problem.
My friend have 530d touring of 1999 like mine.
When the car run at 110 Km/h the car under it shakes, after when go to 120 Km/h or low 100 Km/h and the problem disappear.
Before this problem, in first time have this problem:
when car not run and with switch on engine the sound of motor is not continuous but with sob,
the turns motor to 1000 g/min and 1100 g/min.
The following feeling is had:
shaking, tremor of the inferior part of the machine.
Other friend have buy the new Audi A3 2.0 TDI and have the same problem of shaking.
Is problem of diesel engine or other ????
Thanks for supports to all.
Comostreet
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