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I have used 20W-50 Castrol GTX in my Goldwings since my nephew started racing drag bikes; He even gave me my first 5 quarts free. He said, with a big grin, "Try it. If you don't agree it at least improves shifting, give it back, and I'll drink it!!"
Kept the oil, used it ever since, just change it every 3,000 miles. That was 400,000+ miles ago.