Ducati S2r 800 high outside temperature is causing problems

[Howie]

Not to stir up more which oil is better argument, but actually car oil is perfectly fine as long as the weight is correct AND there is NO molybdenum. That is what causes the clutch slippage. Typically the high mileage additives are in oil labeled for high mileage. I've been running car oil for awhile now and no clutch slippage on my s2r800. I personally find that oils labelled "for motorcycle" are just the same as normal car oil jjust overpriced.

I usually run Shell Rotella Synthetic 5W-40 Motor Oil as it's cheap by the gallon at wallyworld

You are correct that any oil of the correct weight, as long as it is not energy conserving should be fine as far as the clutch goes, but post SJ rating car oil is often missing the additives needed for protecting transmission gears and camshafts. 

[memper]

FWIW, during my oil cooler delete I used Mobil 1 15W50 silver cap. Oil temps have not broken 180F and the clutch is completely stable. This particular auto oil does not have friction modifiers. And it was better than paying the $25/qt at the bike shop for 4T 15W50.  

(Yes, I will be changing the oil to lighter weight for the cooler months)

[sweet8]

I had plain, chevron 10w-40 oil that I used to use for my ZX-10R that I thought would work for the Ducati as well. My mistake.  I changed the oil over the weekend and it's made a world of a difference. No more weird throttle jumps or other problems. Thanks for all the replies. If the problem arises again, I'll post back here.

[Raux]