RE: What type of oil do you use?
Royal Purple in my engine and front and rear diff. I am using the Purolator Premium line I forgot what they are called filters on my truck. I had been changing the oil about every 3k miles but have let it go almost 5k now and am planning on letting it go to 5 as It's just too expensive to keep doing it every 3k although I may go back to it after this time. On my 06 Honda I use RP with Honda filters, on my Chevy I used Mobil 1 Synthetic only because they were sold out of RP (most likely will use RP next time) with I think I used a AC Delco filter, and in my 96 Honda I use RP with K&N filters.