I've read a spectrum of opinions regarding the effects of 5w-20 on engine longevity. Some say that 5w-20 is way too thin and will cause premature bearing and ring failure. Others say that 5w-20 is fine, even in the hottest climates, and will have no ill effects upon an engine. Since Honda and other manufacturers have been recommending 5w-20 for several years now, there should be some folks with some long-term experience with this viscosity oil. Is there anyone who has an engine with over 100,000 miles that has been fed 5w-20? If so, have you experienced any premature wear or other oil related problems? Conversely, is there anyone who has run 5w-20 exclusively, has stayed within manufacturer's OCI and has experienced any engine damage or failure as a direct result of the use of 5w-20? Please elucidate and mention brand of oil, filter used and OCI. Info about UOA's, compression tests on engines, etc. will also be helpful. Thank you for your responses.