I would service all the fluids (coolant flush, fuel filter, oil, ATF, brake flush, air filter, etc) along with the ignition system (plugs, cap, rotor, wires) and drive it. While in there inspect for oil leaks... check the upper timing case cover (common) and inspect the breather from the valve cover to air filter assembly. Also the "PCV" style breather is right in that area and is probably brittle is can be... easy to replace while in there. If valve cover gasket seeps, replace it too.

Replace all the fuses and clean the contacts in the fuse box. This may be the issue with your sunroof and seats.

Eye the fan belt and all hoses, if they look suspect... replace them.

Performance is what it is, an inefficient (by todays standards) EFI system, non lockup converter, and 177hp. They are quick vehicles but not fast. Just take it for what it is at face value.

Better econ? Syn gear oil and in the motor can extract a bit more economy along with sensible driving. Use a volt meter to see if the O2 sensor is cycling properly, but from the neglect it appears the vehicle has I would bet on replacing that also.

I agree, leave the sunroof shut until you are ready to deal with it.



Lastly, you need to obtain the Factory Service Manual on disc. This shows you how to fix just about everything.

Enjoy the car.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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