I live near Phoenix and it will be getting hot very soon. I want to ride as long as I can into the summer. 100 degree days would still be tolerable for me but I'm concerned about my motor. I plan on going full synthetic my next oil change. Price is not a consideration. I use K&N oil filters and currently have Castrol Evol Xtra semi synthetic oil. I read about a few synthetics including Honda HP4S. That only comes in 10w30 though. Suggestions?