I inherited a 1991 853 with a business I bought. It leaks hydraulic oil so I added 2.5 gallons of Bobcat hydraulic oil last summer. Is there any reason I can't use the Citgo HyDurance AW46 Hydraulic oil from Costco. Citgo web product address is http://www.docs.citgo.com/msds_pi/C10203.pdf Here is part of the product spec sheet: CITGO HyDurance AW Fluids are formulated with high quality base stocks and premium additive components to offer trouble-free service in high-pressure, high-output industrial hydraulic circuits. CITGO HyDurance AW Fluids offer: Thermal Stability: Superior resistance to heat-related sludging in sensitive electro-hydraulic servos. Hydrolytic Stability: Will not contribute to the formation of metaletching acids or corrosive reactants. Rust and Corrosion Protection: Inhibited against rusting in both fresh and sea water and pass both A and B Sequences of the ASTM D665 Turbine Oil Rust Test. Wear Protection: Excellent antiwear protection to pumps, motors, valves, and other hydraulic circuit components. Approved against stringent equipment performance requirements. Anti Foam Performance: Resistant to foaming and will not foster abnormal air entrainment in properly designed hydraulic circuits. Demulsibility: Readily separate water permitting draining of contaminating water from circulating systems. Excellent Filterability: Premium performance in wet and dry filterability testing. Thank you, I appreciate the help Greg
