Yikes. This is going to make me much more cautious about the vehicles I'm choosing. I've written elsewhere about the problems I've had with National cars at PDX - I've experienced many of these things, none of which were my fault. My last rental was in a car with both a "service overdue" warning and a "low fluids" warning, and I was told to ignore both of these. My previous rental had a ridiculously sticky interior. Again, both of these were the condition I got the car in, and also the condition I returned the car in (although I did try to clean up the sticky mess, so I probably returned that car in a better condition).