My 1989 M103 engine is losing oil. I'm not sure if it's buring or leaking.

I have read that the M103 leaks Oil at Top of the Timing Chain Cover, because of the gasket. I have also read that the M103 leaks Oil near the right rear of the engine block - Head gasket. I'm not sure how much oil the M103 engine normally burns.

In my car I see some oil on the plastic guard under the engine below the alternator. I'm not sure if it's freah oil or old. The right rear of the engine block looks dry. I took a quick glance. I will give it a thorough look and then I will clean the engine to see if there are any visible leaks/spots. I'm not sure if the engine is burning oil either. The previous owner spent a lot of money maintaing the car. I was looking in the service records and found this:

14MAY99 189 338 km
Wheels - Two, R & R $57.32
Brake Pads Rear R & R $19.92
Cylinder Head - Single, R & R $602.91
Replaced Exhaust Manifold Gaskets $99.60
Engine Cooling System, Flush $349.21
Inner Door Panel - On One Front Door, R & R $490.64
Door Lock Cylinder - For L/Front Door, R & R /Replace If Required $33.20
TOTAL $1652.80


27OCT97 179 989 km
Exhaust System - After Catalyst/Front Pipe Connection, Replaced $612.89
Belt Tensioner Shock Absorber - Single Belt Drive Replaced $91.23
Automatic Transmission (722.0 TO 722.4) R & R $356.40
Crankshaft Driven Plate/ Ring Gear R & R $32.40
Starter Motor Replaced ( While Transmission Is Removed) $446.92
TOTAL $1539.84

***Cylinder Head - Single, R & R $602.91
Does this mean the Head Gasket was replaced?

BTW- Does anyone know what this is:
***Automatic Transmission (722.0 TO 722.4) R & R $356.40

Thanks in Advance

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz