My daughter LOVES riding in my Jeep so far. She just turned 6, and she loves to either sit in the front seat (which she NEVER wanted to do in mom's van or my old Grand Marquis), or in the very back - so she can get in through the tailgate!
Haven't started changing my own oil yet (now that I have a vehicle I can crawl under again!), but I can't wait 'til the first time she comes in the house all gritty & oily. Mom will doubtless have a large-type cow!