Just bought a 90Qs 20V with a "few" issues.

[Kent McLean]

Tessie McMillan wrote:
> Seems to me if running unmatched tires on a street car can wear the diff 
> (or at least that's the local legend...), running at high speed with the diff 
> locked sounds like it could do damage. 

That's why Audi put in the automatic "diff lock off at 15mph"
switch.  But the lister talked about running on dirt.  The diff
would turn the wheels at the same speed, and the tire(s) would
slip on the dirt/gravel, preventing damage to the diff. The same
would apply to running the diff lock on snow or ice.

-- 
Kent McLean
'94 100 S Avant, "Moody"
'89 200 TQ, "Bad Puppy" up in smoke