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Blue smoke is not good!! Piston rings are bad or valves. On a Mercedes it will cost you more than the car is worth at this point. Unless you have a sentimental attachment to the car and really really want to keep it., I would get rid of it. 123,000 mile is a great life for a 1989.
Worn valve guides allow oil to drain into the cylinders, causes blue smoke, fouled plugs will idle rough.
Coolant in the cylinders from a blown head gasket will cause white smoke.
valve seals are going. when car sits excess oil gets past the valve seals then when you staRT up it burns the oil off then runs fine and no more blue smoke. It is fine to run like that had the same in a dodge caravan 1996 6cyl. ran another 100 000 km. and still ran fine got rid of it for other reasons.
Vacume leak or bad idle motor. With the car in park and running with the hood open listen for leaks moving your hand around the different hoses looking for a change in the sounds that you hear. The idel motor also makes the car idel up to 1500 RPM or so right at start-up then idel down, If it doesn;t the idel motor is likly. Check engine light is on when running? Test for codes, Follow code test charts don't skip any steps!.
It likely has worn out or hardened valve seals in the head(s). Oil is leaking into the cylinders through these seals. I'd try a seal softening agent in the oil before doing a valve job. Check your local auto supply for such stuff. A good mechanic can replace the seals without tearing off the heads.
you might want to replace the plug end. I had a 99 neon with the same ploblem changed the sensor but the plug was shorted, changed that and it run great ever since.
Sounds like your automatic choke is giving you problems. Check to make sure the choke is operating correctly. If it ins not backing off as the engine gets to operating temp it will cause a rich condition and excessive black smoke out the tailpipe and extremely poor fuel mileage.
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