How do you change the oil on a 4 stroke outboard motor?
Beside this, how often should you change oil in a Yamaha 4 stroke outboard?
For a 4-Stroke Yamaha, the required oil change, after the initial 10 hr. service, is 100 hrs, confirmed by a Yamaha Master Technician (one of only two in the state).
Also to know is, can you use car oil in a 4 stroke outboard?
Yes you can use motor oil in your 4 stroke as was stated. However True Marine 4 stroke oils have additives to help prevent rusting. Here is what Amsoil has to say about their Marine grade Synthetic oil. And yes it is approved by NMMA, API and FC-W testing as well as all Outboard manufacturers.
Frequency. Most engine manufacturers recommend that you change your oil every 50-100 hours (check your owner's manual for your engine's exact interval requirements). This applies to both gasoline and diesel engines.