The approved fluids that our log splitter hydraulic systems may be filled with are: Dexron III Automatic Transmission Fluid, 10W AW Hydraulic Oil and AW-32 Hydraulic Fluid
http://buysinopec.com/collections/premium-aw/grade_iso-32
(AW-32) 5Gal Pail, 55Gal Drum, 275Gal Tote Bulk