My grandfather recently passed away and my father and I are trying to due some maintenance on all the equipment he owned. It has been a pain to locate parts for his old tractors and such. I was just wondering if anyone has a suggestion for the hydraulic oil we should be using in the skidder. It's a 1967 Timberjack 230 I believe. I see the old John Deere 303 is very cheap but I have concerns on it's ability in the cold as it will be used well below 0*F. I can see my gramp had been buying supertech stuff, AW32 if I recall correctly. Also, I saw some at Tractor Supply, "Traveler Premium Universal Trans/Hydraulic Fluid." On the back of this it says it's 10W-30. I appreciate the help.