Excavator jay
Member
Anyone tried adding tranny fluid to diesel fuel to add more lubrication.
There is a standard for test for diesel fuel lubricity - ASTM D6079. It is measured by creating a "wear scar" on a test rig using a sample of the diesel as a lubricant. The maximum size of wear scar permitted under the standard is 520 microns.
In days gone by the level of sulphur in the diesel provided as much lubrication as was required (and more besides) to keep injection system components happy. With the advent of Ultra-Low Sulphur diesel (ULSD) the subject of lubricity has been front and centre.
Provided the fuel you are using meets the minimum lubricity standard in ASTM D6079 IMHO there is no logic in adding extra lubricant. As a comment most fuel out of refineries these days analyzes somewhere around 300 microns in wear scar size.
You could quit doing it and you still wouldn't have issues, because the fuel injection systems don't need any more lube than is already present in the fuel.With the admin of ULSD 15ppm this old timer has a diesel tank he adds transmission fluid to it, not saying it’s right or wrong just wondering if anyone else has dealt with the ULSD this way. The new fuel injection systems would like the added lube.
The old timer runs about 15 tractors and few loaders, doesn’t have to many issues we hear of.