It's always hard to know if this stuff works unless you neglect your engines and then use it. Otherwise, it's about NOT noticing any problems, and I rarely do, so I say it's worth it. The price is high? Yes. But unlike most products that claim to be better for their brand, rumor has it that the YAMALube at Yamaha Motors is actually better than anything else. It's not scientifically proven, it's approved by fishermen lol.
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