I just acquired a new old log splitter as a project. the engine is bad and it has probably been sitting for the last 30 years. Judging by the engine that's on it I would guess it to be from the early 60's or 50's. Luckily the moisture has seemed to stay out of the reservoir as the hydraulic oil looks ok and their is no rust, However I still would like to put fresh oil in it. The current oil looks like ATF but doesn't smell like it. Are their any hydraulic oils that are red and thin like ATF? Anyone experienced with hydraulics know what type of oil this would be and what I should put in it?