Oliver 1365 Hydraulic Fluid Type?

[Bud589]

Long story short, I had a hydraulic system issue. Went through the entire system, troubleshot it, and fixed it. It’s working great now. I flushed and serviced it, now I’m doubting my fluid choice. It’s a 1974, I’d rather change the fluid out now before I destroy the new pump working it all summer. If it’s wrong what should I put in it?

 

[rrlund]

I just run a good store brand medium hydraulic oil in mine. No need for a premium Hy Tran type.