what is the proper oil to use?
oil change on 1997 Audi A8 Quattro
use good oil, synthetics are best. when you replace the oil filter make sure the aluminum cover does not hit the alternator positive post. it should have a black cap on it, but they usually fall off.
You can find the specifications for your vehicles engine oil and other lubricants here: http://bit.ly/5k7rcr
in my experience the 4.2l motors like the heavier 10W40 brews. synthetics may provide an economical advantage over the long haul - fewer changes.