I have a 2008 650j 4800 hrs , after 2 hours of running hydraulic oil over heat light comes on.i stop let cool for 15 min and will go for bout 2 hrs and do same thing. everything works fine evan when gets hot. I pressure washed radiator till like new, changed filter, took valve body off and had tested. when got hot I shot with temp gun- valve body 220, tank 210, pump 200,
hottest cylinder 190. any suggestions will be greatly appreciated. one last question is there a screen/filter inside tank mabey? thanks