no you did not just get a 1986 trx300 !, honda did not make the trx300 until 1988 bro . what you may have is a 1986 trx350 fourtrax ?. or, you have your trx300 years messed up ? . post a pic, then we can see what you REALLY have ? .Hey, I just got a 1986 honda fourtrax 300. I'm relatively new to this. I was just wondering if anyone could help me out with details for it, mainly like what oil can I use in it, how often to do oil changes etcetera. Any help with proper care tips would be greatly appreciated, thanks.