Regardless of the model or year, you need to do the following:
1.Check valve seals
2. Check the timing chain
3.This is most important replace, replace all of the hoses includes vacuum hoses.
4.Keep an eye on Power Steering Consumption. if it is using it its leaking it check power steering hoses and box,
5.drain rear end replace fluid.
6. Drain transmission replace fluid and filter.
7. no oil leaks anywhere go to synthetic. it will still use a quart every 5000 miles
8 Take the antenna to a GOOD radio shop and have them replace it I spent a whole day on this trying to align it and get it to fit properly. The second time I went to a shop replaced it while I waited
9 Dont forget the monovalve if you have one replace it. Not sure on your car
10FIND A MECHANIC OUTSIDE DEALERSHIPS A GOOD ONE WHO IS LESS EXPENSIVE BUT KNOWS THE CARS.
TRY THIS GO TO A DIFFERENT MECHANIC FOR EACH FLUID CHANGE. PAY THE PRICE AND TALK TO THE GUY IF HE IS EXPENSIVE DROSS HIM OFF YOUR LIST YOU WILL FIND ONE THIS WAY
I just sold my car on /eBay to a Parts Guy in Amsterdam I found I could lease a car for what I was paying in parts and repairs.Drop it off every 3 years. I cried when it left my ysrd seriously Loved that Mercedes.

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1988 560SL
Black Pearl/Palamino