High speed vibration - need help tracking down

[lswing]

Thicker oil dampens noise. Its more appropriate for the high torque. Will only use 75-90
on a stock 4cyl or 6cyl car.

Have ealao used 190. Haven't tried the 250wt yet...

Aha, thanks.

Had vibration caused by out of balance tires, and then worn bushings on front control arms, couple possible causes.

[G2]

Aha, thanks.

Had vibration caused by out of balance tires, and then worn bushings on front control arms, couple possible causes.

Don't think these are related to the OP comments, but never know. If/when your tires are balanced again, be sure they are 'hot balanced'. Numbnuts Big Box Retail tires shops used to make my balance worse 1/2 the time. I have high tech tire machines. I can usually get a nice non bent wheel assembly down to 1 gram on both wheel planes. Don't know of a single shop that does a High Resolution balance. Industry standard 7gram. Not adequate or acceptable for an Audi. Use RoadForce, assuming they can get it down to 3 grams. Cheap tires don't help. Get tires balanced every 5K miles or 1X per year min.

Anything over 3-4 grams and I'm feeling it. Most people don't/can't notice it. In the long run your suspension, wheel bearings and shocks sure will. Here's where I say "ask me how I know".

Worn suspension won't per se cause vibrations. Surely will exacerbate it.