After reading many oil threads on this site I decided to take pretty well everyone's advice and use Mobil 1 20w50 Full Synthetic in the crankcase. Was using H.D. 20w50 dino oil and made the switch in June of this year. What I found with Mobil 1 is a cooler running engine of course - just like everyone claimed. Also the oil seemed to warm up faster but once it reached 200-220 deg, it seemed to maintain that temperature while the H.D. dino oil would always exceed 230 deg and sometimes reaching 250 deg. This is all old news to everyone of course. Very happy with the engine temperatures all summer long(in my case - no need for an oil cooler) but I also noticed though that with Mobil 1 there is more valve train noise. It’s not the cam chain, not the cam chain adjuster, not the lifters because I noticed this right after I made the switch. I also read the same observation with using Mobil 1 on another site. Spectro Heavy Duty Platinum Full Synthetic 20w50 was used and the valve train noise was gone. Would like to give this oil a try and I am sure it is just as good as Mobil 1 but it’s almost $15 a pop!! I use their Platinum 6 Speed in the transmission and it serves well and I’m thinking maybe their engine oil is what they say it is. Spectro’s 20w50 Full Synthetic is hardly mentioned on this site so any feedback would be appreciated.