when you change hydro oil - - -

/ when you change hydro oil - - - #2  
I go by hours, it takes me 5 years to get to 400 hours. If I were a heavy user I'd go with used oil analysis, but after 5 years, the fluid needs to get changed.
 
/ when you change hydro oil - - - #4  
Well the short awnser is it depends. Hydrostatic drive? Just a cheap log splitter with a $100 pump? Big difference.
 
 
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