ZD Series Tractors : ZD18, ZD21, ZD25, ZD28. BX Series Tractors : BX1500D, BX1800D, BX1830D, BX1850D, BX1860, BX1870, BX1880, BX2200D, BX2380, BX2670. It effectively cleans hydraulic fluid and protects core system parts from abrasion and premature failure.