I have a Bobcat 751F and want to change the oil in the gear case and hydraulic system. I would prefer not to use Bobcat branded oil and filters to save money. Here are my questions: Hydraulic Oil: what oil do I need any ISO 46 grade? May I use a Fram or Wix brand filter and if so what are the part numbers? Where can I get the small in line filters and what are their part numbers in Wix or FRam? Can I just drain the hydraulic oil and refill run it for a few hours and drain and refill or do I need to flush it first? Gear Oil: What type or ISO number oil do I need for that? Thank you any help you can give me