Elizabeth Schutt
Member
Changing hydraulic fluid in late 1970's Case Drott 40 BEC excavator. Old fluid appears to be red - possibly ATF? Retracted as many cylinders to evacuate as much fluid as possible. Manual recommends Drott DHF fluid or as alternate SAE 20-20W for my temp range (50 degrees F to 210 degrees F - system temp). I do not plan on using this machine during the winter. Guy at NAPA recommended using ISO 46 (20W). Would this be a good subsitute? Any thoughts or recommendations would be appreciated.