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20/40... here we go again...:) your owners manual has a chart in it for the temps you ride in. but it basically comes down to run what you wana run
 

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10W40 was the best all year around oil. 20W50 is just too thick for cold temps. At least thats what the dealership said. Also its what I gathered from that chart in the manual. :-\
 

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conventional wait til you get higher miles before you run synthetic 15 or 20,000 miles and change your oil every 3,000 miles
 

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vicarc said:
Out of curiosity... why wait?

the engine seals and components has to wear in properly the additives in synthetic won't allow it to do it properly. I myself will not run synthetic in a bike that it doesn't call for synthetic oil just my input.
 

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The oil debate is always interesting: Here is some good reading.

Myths from the Mobil1 site . . . . . . . . .
the seals question is answered here.

http://www.mobiloil.com/USA-English/MotorOil/Synthetics/Myths.aspx


Synthetic oil is made from crude oil . . . . ??? :-X

http://www.mobiloil.com/USA-English/MotorOil/Synthetics/What_Is_Synthetic_Motor_Oil.aspx

Viper Motorcycles which makes the most powerful production V-Twin in the world (152 cu. in.) ships with Mobil1 in its gizzard. Just sayin!

I know a lot of you guys know about the Amsoil white paper, so here is the link to the current edition. It is pretty technical but still readable and understandable.

http://www.amsoil.com/lit/g2156.pdf
 
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