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Most big Vulcan riders I know use Rotella 15w40 and a lot of Harley owners use the 15w50. You can use ANY 10w40 as none are Energy/Resource Conserving meaning they are wet clutch compatible. I'm a full-time motorcycle mechanic and have used 10w40 high-mileage car oil (semi or full synthetic) exclusively for over 20 years. I have a 2020 Magician and use Castrol GTX semi-synthetic 10w40 I get from Amazon for $17.95/5qts.
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