1. 

   JohnKaz Well-Known Member

   I’ve heard 5w30, 10w40. Never actually saw any factory recommendations though.
   
   Any info appreciated!

    

   JohnKaz, Jun 8, 2019

   #1
2. 

   Mike B in SC Well-Known Member

   I run 10w30 in my 68 GS400.

    

   Mike B in SC, Jun 8, 2019

   #2

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