I'm about a month into ownership of my used 2010 Golf TDi 6 speed manual and am still trying fix (with the dealer) a vibration that occurs between 60-75 mph. The dealer has been great in trying to help, but unfortunatley hasn't nailed the problem yet. The car has 21k miles on it. This is my first VW, but I've owned/own several Audi's and older Porsche's. I like to DIY and am used to quirky problems but this one has me stumped! To decribe the vibration, it comes on around 60 mph, peaks around 66 mph and peaks again around 71 mph. It's in the steering wheel and the seat, it's pretty much all over the chassis. The amplitude of the vibration is dependent on the load. For example, going up a hill in 6th gear, adding throttle will amplify the vibration. In addition, on a level road in 6th gear, lightly and slowly modulating the pedal, staying +/-2 mph around one of the peak vibration speeds (say +/-2mph around 66 mph) I can keep the vibration steady. The vibration is still very noticeable between 60-75 mph, and spending 2 hours a day on the highway, it needs to go away I've also tried putting the car into neutral starting at 75 mph and coasting down to 60 mph, the vibration is still there, but certainly less. In terms of sounds, there are no clunking, popping or banging sounds in the suspension, even if I drive a bit hard trying to amplify any issues. There is a sound that seems to oscillate with the vibrations, but it's hard to describe and it's very light. There is certainly somthing "not right" about the sound though. Here's whats been tried/checked so far: 1. I've tried a set of 18" OEM BBS rims with 1 year old winter tires, a recently purchased set of 18" RS4 reps with Yokohamas, the OEM 16" rims/tires off our A4 and the stock 17" rims/tires(Hankook) that came with the Golf. All sets are smooth as butter on our A4 but on the Golf the shaking persists. These rims are all Audi/VW centerbore and offset so there's not wheel/hub mating issues. After trying four sets on the Golf, I'm convinced the tires/rims aren't to blame. 2. The dealer replaced the left front drive axle citing that it had a little play, didn't fix the issue at all. They also re-balanced the factory 17" wheels, no improvement. In fact after this "fix" my wheel now points slightly to the left because they probably disconnected a control arm to make room for the axle removal, then didn't bother to do an alignment afterwards. 3. I checked the tightness of the large drive axle bolts in the center of each hub, they are tight. 4. I put the car on ramps, took off the belly pan and checked every bolt I could get my hands on (control arms, ball joints, anti-roll bar, sub-frame, etc...) While underneath I also slowly rotated the tires to see if the drive axles had any strange movement. Everything seemed fine. 5. I put the car on jack stands and did the 12-6, 3-9 O'Clock pulling/pushing on the tires to see if a wheel bearing was loose or if the tie rods were sloppy, nothing I could detect. They sure shouldn't be sloppy with 20k miles on the clock. 6. Checked the motor mounts, kind of, not really sure how to check these. What I did was put the car in 1st gear on a level surface and pushed it forward and backward. The engine would rock, but I have no idea what is acceptable. Whats the likelihood an engine mount is bad at such a young age?The dog bone engine mount underneath looked fine, bolts were tight. What else could it be? Out of round hub? Bad flywheel/harmonic balancer? Something in the transmission? Upper strut mounts? Satan? Not much attention has been paid to the rear end yet, but I never suspected it given the depedancy on throttle position. I'm really at a loss, and if I'm at a loss, I don't have high hopes for the dealer. Unless they have someone with plenty of experience, that would just so happen to know from the symptoms and feeling when driving the car, I'll probably be going back for months to come as they slowly replace parts. If there's anyone here in central CT that thinks they could figure it out after driving it a bit (or if you can recommend a shop with VW "Voodoo") any help would be greatly appreciated.