My check engine light just came On ( 96 xj6) which made me change the
oil and take it to a shop for a comp dia.  The mech. found that i need
a thermostat ( a quote of $250.00 ) and that might help with the
light. Is the thermostat housing  connected to the upper hose?

Does anyone know if the 95 RON rated premium fuel required by my 1990
4.0L is the same as the ??? 91 rated premium fuel sold by Petro Canada
in Ontario?

1990 xj6 4.0 Sovereign front wheel bearings
Anybody know offhand how much torque should be put on the wheel
bearing retaining nuts?

My gas gage (and range indicater) is all over the place and not even
close to accurate (always less than what is in the tank).  Any
suggestions would be appreciated.  thanks dan

1990 xj40 dual exhausts?
I've been under the car a few times this past week, patching a small
exhaust leak and doing other repairs, and I'm sort of wondering about
the design of the exhaust system.