-> RJT> Feel the difference in the oil?  

-> WC> Sure, used to change at 3,000 until I noticed. Bikes run hotter 
-> WC> than car engines, at least the air cooled ones do. After I noticed 
-> WC> the change in viscosity I checked the dip stick after 2,500 until 
-> WC> I hit the economic - maintanance sweet spot of 2,800 miles. I 
-> WC> always used Castrol 10 - 40 or 20 - 50 whichever the manufacturer 
-> WC> recommended.

-> Hmm.

 I am a Castrol 20-50 man myself. I just bought a 1998 Chev S10 Pickup
and note that GM strongly recommends against using any oil heaver then
30 Weight. Interesting, Cannot immagine why.
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