I contacted Liqui Moly Germany website. Their Application Engineer has been replying within minutes. He recommended 10W-40 fot Yamaha YBR. As per him, if the fuel is High Quality, you can go with oil for 6000 KM or 12 months. I'm sharing screenshots of our conversation.First:
Second:
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I said its average. Was just thining that if we have good quality fuels, our bike oil will have so long life.
