"Clean" diesel in the US is ISO 4406:1999 18/16/13 which means there are between 1300-2500 <4 um particles per mL of fluid, 320-640 4-6um particles per mL, and 40-80 6-14 um particles per mL. The filtration system on a modern T4 diesel needs to take that 18/16/13 fuel and clean it to ISO 13/11/7 to get adequate hpfp (on common rail) and injector life. ISO 13/11/7 is 40-80 <4 um particles, 10-20 4-6 um particles, and .64-1.3 um 6-14um particles. These particles may be wax, silica, organics, etc. Your eyes can't see them but they plug filters over time. The switch from summer blend to winter blend releases a lot of crud in all the equipment from the refinery though the pipelines, bulk tanks, tank trucks, and vehicle fuel tanks so fuel is "dirtier" in the early winter and filters don't last as long.
I've seen worldwide fuel quality studies and the US is pretty good in terms of cleanliness but I have caught samples from bulk tanks in mines in WY with fuel that was ISO 25/23/20 (160,000-320,000 4um particles per mL). We designed filtration systems to get half filter life (250 hrs) at ISO 24/21/19 and in most cases would last much longer than 500 hrs on good fuel in US.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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