I have just had the engine rebuilt. The pistons are the 1st over size.

Tech questions:
1. How will this effect my fuel mileage?

2. Does the car have more horsepower?

3. After driving -Should I wait 15 seconds to turn off the car? For the turbo oil.

4. I have gone about 200 miles and the oil is jet black. I will replace it at 500 miles.

Most important• The break in period

City or highway driving?

The car is faster off the line than my 560sel. I hope that the engine will remain the same. I got to 75 without a problem.