difference

 

A mechanic was removing the cylinder heads from the motor of BMW Car  when he spotted the famous heart surgeon in his shop, who was standing off to the
side, waiting for the service manager to come to take a look at his car.

The mechanic shouted across the garage, ? Hello Doctor!! Please come over here
for a minute."

The famous surgeon, a bit surprised, walked over to the mechanic.

The mechanic straightened up, wiped his hands on a rag and asked argumentatively, "So doctor, look at this. I also open hearts, take
valves out, grind "em, put in new parts, and when I finish this will work as a new one. So how come you get the big money, when you and me is doing
basically the same work? " .

The doctor leaned over and whispered to the  mechanic.....
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He said:" Try to do it when the engine is running