My mechanic made the following recommendations:
1. Don't wear jeans or other pants with metal rivets/buttons as these can damage the leather seats.
2. Keep mousetraps in your garage as rodents like to make a home out of the engine.
3. Keep a fire extinguisher within easy reach in the car, preferably mounted behind the seats if you have room. He's seen way too many engine fires.
4. If you live somewhere humid and your garage is not climate controlled, run a dehumidifier in the garage.
5. Shift into neutral at stop lights.