To Terry and whoever may be interested,
I remember the "great oil debate" and it was the 15/40 Shell oil. But another gentlman happened to mention that Walmart sold another 15/40 oil called SuperTech ( I believe it's made by Penzoil) that is much cheaper - .98 cents a quart.. And being the frugal man that I am, I gave it a go. I took two 750's with the 15/40 SuperTech and rode to Mobile, Al from my home in Boaz,AL, a 1000 mile round trip. The whole trip felt like we were riding in a frying pan - the asphalt was so hot. It was 100* plus. I was changing the oil at 1000 mile intervals and oil filters every 5000. I rode all year with the same brand of oil. Averaging 9 to 10,000 miles a year. The following year, I met Andy and Axl from the Easy Rider trip at Bud's in New Orleans. This time we had three 750's all running the same oil and it was hot as hell. It was in the 100's again and we got caught in rush hour when we were leaving New Orleans. Traffic was so tied up we could only move a few feet every five minutes. The bikes were so hot that the valves were pinging on all three bikes. We finally got out of traffic after 45 minutes. The bikes cooled down and came right back to normal. To this day I still run the same oil and change my filters the same and have never had a problem. My bike has 54,000 miles on it, the other has about 60,000 and the third says 38,000 but we have our doubts. So the choice is yours. The SuperTech is about $5.50 USD for a gallon.
John de la Parra