When the dealer plugs his computer into your car...

[wetsuff]

What can he tell besides the usual codes?
I mention it because I think I read the computer will register an 'over rev'ed' situation..

If so, how long would it retain the memory? What else get's into memory?

I'm going to end up with a car off lease where I will never speak to the owner, nor know the dealer who serviced the car..and what was done.

Jim