Hello, I have recently bought a '94 case 580sk backhoe. I believe most of its life it's just had universal tractor fluid in it. The factory spec I believe is case hytran in everything except the engine. I'd have to go into a local case dealer, but seen $95 for 5 gal of hytran on the net. I been topping off with traveller's premium universal fluid. Soon I'd like to change the fluid out and get the best fluid in there as possible without giving up both my arms lol. I believe the hyd. System and transaxle hold something like 30 gal or so. I've also been told by a couple farmers that the John Deere hyguard is better. JD hyguard meets case's hytran spec, but not the other way around and people have had problems running hytran in jd tractors, but no problems running hyguard in case tractors. I'd just like to do what's best for my backhoe and I don't believe it's running cheap traveller's premium universal fluid. Any help with some proof would be nice. I'm thinking just running hytran so I know it's right and maybe it'll perform better.