400EX oil
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I too am in the hot southwest, but I don't ride during the heat of midday. Plus, we mostly ride the mountains anyway, where it is cooler than the valleys....so I run Redline 10W40.
If you do ride in the heat of the day, I would run Maxima Extra 15W50.
If you do ride in the heat of the day, I would run Maxima Extra 15W50.