The vehicle component system seems like it is intriguing a lot of people. I guess certain things, like Oil filters could be added, since a car will not run without one and since they only fit a limited number of engine block types, they would be vehicle specific. The opposite of the component scale would be parts like air filters, since vehicles can run without them and they can be 'bodged' to fit different engine types. But they would enhance the reliability and life of the engine. In the same way, lead-acid batteries would be universal. but heavy objects to carry around. The other major items engines need, would be fuel, oil (which for scooters, etc, could be specific, like 2-stroke oil, for best results.) and, for larger vehicles, water for cooling. Then, there would be aviation parts for helicopters which would make then very highly desirable.... A shrewd player could be making a lot of profit as a trader in future builds of Day Z, provided they do not get shot....