Lawrence Tarnoff, I would suggest using a Caterpillar product ( Diesel Fuel Conditioner )
Part Number 256-4968
As sulfur restrictions become more stringent, Caterpillar Diesel Fuel Conditioner will help
compensate for reduced lubricious found in some low sulfur diesel fuels. It will also improve
combustion, fuel storage stability, and fuel system life. Would suggest storing motorhome
fuel tank full of fuel. Dave Atherton Retired Cat Mechanic