I just bought a new JD tractor that uses hydraulic oil in the hydraulic system operating attachments. I am using attachments from my JD320 skidsteer on this tractor. The JD320 hydraulic system runs on Plus 50 motor oil. I am concerned about regularly contaminating my tractor's hydraulic system by using attachments with lines filled with motor oil. My question is, will the JD320 hydraulic system work if I flush out the Plus 50 motor oil and replace it with Hydraulic oil? My local JD dealer couldn't answer this question.