Postby damieG82 » July 21st, 2008, 9:45 pm
You might want to do a test first to narrow down which mount(s) it might be... and maybe save some money in the process.
Observe the level of vibration in park, reverse and drive... I wouldn't include startups cause I think all cars experience a little vibration while the engines is tumbling.
If everything is ok in park, shift to reverse. If the vibration starts then it's most likely the mount closest to the radiator. Likewise, if the vibration occurs in the drive gear, then the firewall mount is the culprit.
I'm no expert but it's been my experience that the radiator and firewall mounts are the cause of most vibrations linked to gear change, because they're directly affected by the twisting motion of the engine when reverse or drive gears are selected.
And as everyone has said, Southern Sales only brings 1.6 and 2.0 M3s, so they should have the mounts for your dad's car.