Doctor vs engineer

A engineer was removing the engine parts from a motorcycle when he saw a famous heart surgeon in his shop...
He went to him & said.. "Look at this engine... I opened its heart, took the valves out, repaired and put them back"...So why do I get such a small salary? and u get huge sums....!
The doctor smiled at the engineer and came close to his ear and said.... "Try the same when the engine is running."

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Continuation....
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The engineer smiled
back came close to doctors ear and said
I can pick any dead engine and make it alive . . . . . . . But can you ???