M1 10w40 4T or M1 20w50 V Twin are the real deal for 5,000 mile OCI's, I've posted many in the UOA section. Amsoil 20W50 in there right now, 3,500 miles on it as I didn't get as many miles this year. It'll go to 5,000 total miles which should be May/June next spring here in Colorado. Will report.