Good Full Synthetic Oil...
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I like the Royal purple. 10 years ago my mechanic and I changed oils and did dyno testing and then changed the oil and tested again. We tried all the synthetics on the market at that time. The bike gained 5 hp just by running royal purple. some other synththetics also gained a couple hp but the Royal gained 5. Anything newer on the market for synthetics I have not dyno tested and cannot comment on.
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