The only fully independent test on the lubricity of Diesel Fuel Additives was done many years back. Over the last few years we ourselves have been collecting and testing our competitors products along with our own to make sure we once again, stay at the top of the lubricity game.

We won't be naming any names, but you can be sure that anything you can get at the Parts Stores, 'Marts', and Truck Stops were tested.

See for yourself how Opti-Lube XL, XPD and Summer+ stacked up against 25 others in the Diesel Additive World.