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Engine oil for GSX1100 1983

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I have been wondering if my bike would benefit from switching to 10W50 full synthetic instead of 10W40 semi synthetic.
Both castrol power 1, but racing for the full synthetic of course.

My bike has 70k km (45k miles) on it, and some of my friends told me that the old bike would benefit from the thicker oil.

What are your opinions.

Best regards

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