To take your subject literally...anything with Techroline. In my region that means Chevron or Texaco.



To add to the subject...my friend has a 93 M104 and I a 94 M104. He doesn't seem to have half the problems that I encounter as far as what's under the hood. Fortunately I'm a wrencher so I have been able to work on things mice elf. If you can find a 400/420 in good shape, I would go for that. Just don't forget that the 300/320 isn't too shabby with +200hp either.