My car has the 103 engine. At 70,000 miles it doesn't have any oil leaks, uses zero oil between 3ooo mile changes. All that it has ever needed according to the records back to day one is a water pump (coolant change schedule hadn't been followed), a plug wire, and injector seals. I drive the car fairly hard, but don't abuse it. Fairly hard means occasional manual up or down shifting at stops or on twisty roads/downhills, occasional hard accelerations from stop, etc.
The engine, to me, is quick and responsive. I get about about 20-22 mpg. My mechanic has told me it will eventually start leaking oil, but that it is a very strong engine.Hope this helps.

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JCE
87 300E, 65k miles
Smoke Silver