I don't know if this has been brought up yet, but I'll give it a go. I have a 2007 Road Glide with 47,120 miles on it. About five years ago I added Fueling cams, lifters and a high velocity oil pump (dealers recommendations). A few months ago I upgraded my Zippers auto tuner with a new part. Now a month or so ago my check engineoillight started to come on. When the light is on it won't turn over, but around the third try it does start and runs good. I've done everything from changing the oil to changing the oil pressure switch. I run Castrol 20w-50 4T motorcycle full synthetic oil in the bike. When I did the oil change the oil had less than 5,000 miles on it and it was sticky and black. Also the oil gauge shows good oil pressure.