Service & other questions

["Tom H." <tom2@mims-iris.waterloo.EDU>]

I recently purchased an '83 Quattro Turbo with 50,000 miles on it, and I
have a few questions that maybe someone can answer.  I have read that it 
is recommended to use synthetic oil and to change it every 3000 mi.  Is 
this true, and if so, what weight?  

Also, the European versions of the same car have 200 hp and the US version
has only 160 hp.  Why the difference and where?  And finally, does anyone 
know the address of ABT?  They seem to have disappeared off the face of the
earth.

Tom Huschilt
tom2@mims-iris.waterloo.edu