Hi Ho: Just my opinion (not worth much), but one of the advantages of diesel is that the fuel generally doesn't degrade much with time. We have an 84 Suburban with 6.2 l. diesel engine in Wyoming that has had fuel (40 gallons) in the tank now for 5 years and we have no problems. (Try that with gas--well maybe not). Battery maintenance is important, but starting the engine and not using it causes more problems than it solves. Diesel is also a natural lubricant so diesel engines don't rust as quickly as gas. Diesel fuel does have one enemy: water. Be sure to service the filter/water separator often. By the way, I have driven over 500,000 miles in diesels, but that is a short distance for professional truckers.