The web address below has an extremly good explanation of the pro's and con's of synthetic oils. It is aimed at off road heavy equipment use patterns but the info applies to us as well. The comparative tables are also very effective in identifying the differences between different base stocks used in oil production.
http://www.machinerylubrication.com/...?articleid=311
Regards,
Abe
2002 SB, CC D/A Combo
Solargizer Battery Maintenance System
Line-X Liner
HD Mud Flaps
Street Pilot GPS
Amsoil Air Filter and rear diff fluid
Catch-All Floor Mats
Double towing 25' Layton 5vr and the Astro
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Astro S20-DC W/ 200 Suzuki
1999 Harley Electra Glide Ultra Classic PCII, Hooker Slip Ons, SE Air Cleaner