gug wrote:

> Having purchased the 98 XJ used, we never got a manual with it. What is the
> recommended gas grade? We usually put premium in it, because it pings with
> lesser grades even after tune ups.

That seems odd, the only time I notice this is when crawling at
very high altitude with sea level crappy California gas.

The manuals are available at DC Tech Authority, best investment you'll
ever make:
http://www.techauthority.daimlerchrysler.com/