I am going to do the 5hr oil change on my new Fastrack 21/54 with the Kawi engine this weekend. Any specific recommendations on oil and filters? I was planning on using Mobile 1 synthetic 10W30 and a Kawi filter, but I would rather use a Fram filter if I can find one. And on the transaxels: Can I use Amsoil 20W50 synthetic in them? Any recommendations on filters there? Still happy with the mower. A little more than I wanted to spend but WAY mower than I've ever owned.