ralfyguy
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I am in Oklahoma. Very hot and humid summers. My brother in law and I run more than 4,500 miles every year. Lots of superslab miles at speeds between 75-90 miles an hour. Often times my wife is on the back seat, and the terrain here is anything than flat. That motor gets stressed hard like that. Hardly ever the tachometer is below 5,000 rpm. Up the hills is full throttle often, especially with two up. Like I said, 105 degrees and 70%+ humidity for several weeks in a row is not uncommon. I think that qualifies. A close to 4" stroke makes for some pretty high piston speeds, no doubt. I used to run Lucas 20W-50 in summer, Mobil1 10W-40 in winter and recently switched to Rotella 5W-40. This will be the first summer with this Oil. I intend to run that oil all year round. With the Lucas, oil consumption wasn't worth to mention. A couple of shot glasses maybe every 1,000 miles. Because less than 20 bux for an oil change, I threw it out every 1,500 miles. I surely doesn't hurt anything. We'll see how it works out with the Rotella. I wanted to give it a try, since countless people brag about it. The bike has almost 15,000 miles down, and all it has been done to it as far as "repairs" is valve gap check three times, where the first one didn't require much adjustments, they were still within specs, but on the upper end. The two following checks were actually a waste of time. Nothing to adjust. The other thing was the cam chain adjuster plunger was replaced at 11,000 miles with an extended one. Fairly early, I know, I have no idea why. Maybe 10 minutes ride to work every day, winter and summer did it. The bike doesn't even get warm like that.
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