Use all synthetic in the bike, a Ford Expedition recently sold with 175,000 miles on it, 04 Monte carlo with 116,000 miles on it, my wifes 2001 Monte Carlo SS, my lawn tractor, 06 Duramax Diesel, and anything else that uses Oil. I guess you might say I'm a firm believer in synthetic oil for everything. If I don't make the miles for an oil change on the engines, I change it once a year wether it needs it or not. Cheap insurance.
Transmissions and gear boxes on the bike get changed with every engine oil change. The cars and trucks, lawn tractor get changed with the recomendation of the owners manual. have yet to experience a failure using synthetic oil on anything.