It was bought back in 2002, and now has around 1500 hours on it. Ive always used Honda 10w-30 as recommended, but recently the 20i has seen around 40-50 hours a week, every second or third week. It gets really hot too, running in around 30 degree heat for up to 10 hours a day. I have some Redline 10w-40 left over and was thinking about using that. Is there anything better i could use? Would like to change it every 100 plus hours, which is twice the manufacturers recommendation with the mineral 10w-30.