Are you buying the right diesel fuel? Ruby-Fieldmaster diesel fuel exceeds all standards for any make or model of diesel engines. The straight #2 diesel has had the most of the sulfur taken out for pollution reasons. The sulfur was the lubricant for your engine. Without this lubricant it can become very hard on the injectors, etc. Ruby-Fieldmaster has an additive package that contains this lubricant. It also gives you a higher cetane for quicker, easier starts and will not gel the fuel as easily. Ruby-Fieldmaster costs three cents a gallon more than the straight #2 diesel. Money well invested. I have talked to patrons who have tried both diesels and they claim they get more power and better miles per gallon from the Ruby-Fieldmaster diesel. This premium diesel can be purchased in either red off-road or clear on-road.