AMSOIL is the premier manufacturer of synthetic oils, gear lubes, filters, diesel products, gasoline additives, etc. Their catalog is free:
AMSOIL - Synthetic Oil, Motor and Engine Oil, Lubricants, Air Filters, Oil Filters and Greases. The oil that I run only needs to be changed every 25,000 miles or 1 year, whichever comes first. Their air filter is high efficiency (better air flow) and can be cleaned over and over. AMSOIL has been proven at the race track and on the street for several decades. It is better for your vehicle (including motorcycles) and you will save money to boot.