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I recently purchased a Yamaha Moto 4 Champ 100cc 4wheeler for my son. I’m not exactly sure what year it is but it’s between 87-91. The service manual shows many different types and weights of oil can be used. I planned to run 10W40 but the API ratings is what’s confusing me. It says API SE or...

I have a 1998 Mariner 40HP. Over the last 5 years of ownership I have been using Yamalube Gear Oil like the one pictures on the left. Today I went to the same boat dealer I always go to that told me the Yamalube oil is what I need. And told them I need lower unit oil. Told them what I had and...

I recently started PMing my boat and trailer. I wasn't having any issues at all but decided I'd rather take the time to freshen everything up before I have a issue. With that being said I started looking up different greases. Found some links and basically from what I read is that a good marine...