Stanadyne Lubricity Formula 2-Pack of 64oz Jugs. Treats 500 gallons of diesel fuel per jug.

Note: All Stanadyne Diesel Fuel Additives can be blended with each other and "double-dosing" is not damaging - although it may not provide twice the benefit. Where engine and vehicle OEMs have approved Stanadyne, most of them recommend Performance Formula, which should be also used year-round to ensure protection against fuel-related problems.