Car Illiterate

I took my car in to get an oil change today. When I went to pick it up, the mechanic told me that I also needed a transmission flush.

I responded, "You know, the thing about transmission flushes is that of all the cars my family has ever owned, none of them have ever had a transmission flush. And it seems to have been fine."

The mechanic returned (under his breath), "If you say so..."

I said, "Did you just say, 'if you say so?'"

He said, "Well, I'm not going to argue with you."

Okay then...