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Mercedes-Benz S420 Questions

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oil leak could this be rear main seal,or head gasket oil leak very clear how do i find out what it might be
I can neither lock not unlock the car using the autolock sequence inside the car or using the controller fob.
I found animal chewed wires and repaired them. I replaced the crankshaft position sensor. I do not get a OBDII error code but car will not start and no spark.
ALL THE TIME! TRIED REPLACING THE THERMOSTAT, BUT DIDN'T SEE ONE. TRIED CHECKING THE LOCATION ON THE INTERNET, BUT NO HELP! THE LOCATION IN FRONT OF THE RADIATOR HAD NONE. I INSTALLED ONE IN THAT SPOT, BUT NO HELP! TAKING IT TO A MERCEDES FIXER WED OR THUR. thank-you.
Recent service included "full synthetic" oil change, Drove 2 miles back home & found dip stick pushed out from its port and oil had been over filled well beyond MB spec. Drained off almost 2 quarts and oil was pitch black. Never before had a new oil change looked like that. ???? Did they reuse the old oil from the pan replacement they did ???
The position sensor was replaced but I am not sure that there may be a washer that goes under it
This has been an on going problem for a couple of years, I've replaced the ICM numerous times, along with trottle body and it reapears after a hefty bill at the repair shop, now my mechanic informs me that it won't communicate with his scanners..I'm at a complete loss, any help will be Greatly Appreciated, Thanks Russell
Need to take out radio for repair
This car has sat for 6 months but prior to being parked it had no issues, when first started it was sounded fine after 30 min of warming up tried to drive it had no power the idle started to go up and down (with no power) and smokes like a steam engine
The driver side light stays on even if the car is off
Replaced the resister. Blower continues to run w.hen car is off. Have to unplug resister to shut off. Heat, air conditioning, blower and controls all work great, except for blower not shutting off when car is turned off.
Mercedes S420
Passenger Window inches up when closing, rear passengers window inches up, passenger side interior lights, rear tail lights stay on, short in headlamp switch, no radio, no electronic back seat headrest adjustment, sun roof sporadically opens. One owner, original 65k mile sat in garage since 98.
When Starting- engine turns over, very loud clunk.
When I apply the gas it decreases everytime.
new wires high temp. new spark plags . new coil. please help me . henry
The truck and doors have to be slammed in order to lock, truck does not close completely.
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