Doctor vs Engine Mechanic

A mechanic was removing the cylinder heads from the motor of a 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 :

What did he say ??? Guess ......>
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
He said : "Try to do it when the engine is running."