> On a 240 is there a quick way to identify if the car is fitted with a
> limited slip differential, other than mechanically seeing if the diff locks
> or not?
If installed, there should be a metal tag on one of the bolts that hold
the diff cover on noting the need for special oil. The easy way is to
jack up one rear wheel with the car in neutral, handbrake off, front
wheels blocked (for safety). Try to spin the raised wheel. If it
spins, you have the open diff. If it won't turn, you have a limited
slip.

Signature
Mike F.
Thornhill (near Toronto), Ont.
NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)