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Since you did change out the Chinese mystery oil, I'd just make sure the level is correct, then check out the valves. If it was low on oil, add what you need and run it again. If the sound goes away, it was the oil level. If you still have the sound, wait for the motor to cool down overnight and then check the valve clearances.
Personally I think it's very loose valves. Even if the sound goes away when you add oil, you really should check out the valves, on general principles.
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