I think it is not so much the engine as it is being able to glance over your shoulder after exiting the car, looking back at the gorgeous piece you spent all morning cleaning and waxing and smiling, knowing you have something special.

When people come up to you and tell you your car is in great shape and inquire "how much" you are willing to part with it for. Despite the near 300K miles on the odometer.

Oh, and the occasional smoke-screen effect when the diesel gets a little constipated: The best method ever for getting rid of tailgating SUV's. The smoke rises over the hood, and they think their OWN VEHICLE is on fire, lol.

Keep you car in good appearance, and you will never tire of it.