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what are the best oils for use in our bikes?

nnnnnnorman,any oil with a minimum rating meeting the manufacturers requirements will do the job. The important factor to consider is your normal range of operating temperature. Synthetic oils generally have a wider range of temperatures they can handle than non synthetic oils

thanks higgy.

One more additional thing in passing

Big diesle engines these days use what is called a bypass filter. There are engines in use with a million miles of heavy duty service and have never had their oil changed. They are now using them on motorcycles as well
http://www.amsoil.com/bypassfilters/vansise/index.aspx

http://www.blackstone-labs.com/by-pass- ... ration.php

http://www.gulfcoastfilters.com/

Almost any heavy equipment service center can do the required testing to extend the time between oil changes for under 20 bucks USD

Amsoil 20W-50 in Paso and LC4.

I've used Amsoil almost exclusively in everything mechanical since around 1976 when introduced to it (the days it came in metal cans). Being minutes from a regional warehouse helps.