Certainly buying proper fuel is good advice... but HOW do you know if the fuel is the proper fuel? Here in USA Diesel can vary from region to region, a person could travel from the south, with non-winterized fuel, end up pretty far north and cold.. then have an issue. Besides, with the VW HPFP debacle, they found even the lubricity of Diesel fuel, and subsequent failures of pumps varied by region due to variances in fuel quality (in this case the now required lubricity additives for ULSD). It's easy to offer good advice on buying proper fuel, but not so easy to follow that advice when it's impossible to be sure the fuel is "proper" when there are documented variances from region to region here in the USA. This is why some choose to run additives, maybe its not needed most of the time, depending on the quality of fuel, but when on a long trip, it becomes hard to know about the fuel quality, and it can be a gamble.. it's not as if you can carry a portable test kit and determine if the fuel is "proper" or not before pumping. For this reason I keep all fuel receipts, so if I do end up with bad fuel I have a chance to hold the fuel station accountable for the consequences.. but hope to never need to do so. I'd bet Canada, being as cold, and north, has much more consistent standards and fuel quality.. thus Boraz, you can easily get "proper" fuel... not so easy for those of us south of the border to know what is, or is not proper. It's not like the pump is going to say anything more than ULSD..