I have had 2 Harleys, one 883 and one 1200 sportsters. I always used 20w50 Harley oil from the dealership. Why did I use it, it was the owners-manuals recommendations so I did. That was a long time before I got on this site. I know I paid more for the Harley oil and filter, but I did it anyway. If I had to do it again now,,I probably would, never had any trouble with Harley oil. I miss ridding now, IM 64, but that's no excuse, I do ride one from time to time on a friends Harley, my favorite is still the Sportster, its just me I guess.