The good ole 5W30 ( I think maybe you folks run 0W30) the factory recommends.
If you do actually run endurance races than run that during the race then switch to a street blend once off the track. What's good for racing isn't always good for the street.
I don't know the MIller brand so can't comment. I run Lubrication Engineers 5W30. Tests better than Mobil 1.
We actually use the Mobil 1 Motor Bike oil, the Racing 4T 15W-50. As we dont have the really cold mornings can get away with a higher base.
The motor bike version of Mobil 1 doesnt have the detergents that the car derivatives have due to the motorbike wet clutches. The main reason we use is that at high heat/usage the oil doesnt "foam up" in the rocker cover and stops excessive oil breathing.
2002 BRG MCS with more mods than can remember The thieves choice in race cars
2005 BEP MCS stock standard and staying that way
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