Quote:
Originally Posted by biker1
A Yamaha representative told me that synthetic is fine. I have been using Mobil 1 10w-30 for several years. The owner's manual only specifies 10w-30 and API Service SE, SF, SG (which are obsolete API ratings). Any contemporary 10w-30 oil is fine.
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I use Mobil 1 10w30 and have for the past 7 years. I change it every 4 months.