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its a 2-stroke, you keep adding oil
Go to Yamahajetboaters.com for complete directions on how to do this.
To change the lower unit oil in a Yamaha 115 four stroke one must obtain proper parts, the proper tools, and instructions on how to properly take apart and put together the parts.
Step 1 Drain it Step 2 fill with 2 stroke oil
The 4 stroke Yamaha outboard requires a quality SAE 10W-40 motor oil.
SAE 10w30 oil or Yamaha 4 Stroke Engine Oil
2004 Yahama 4 stroke 225hp oil filters
Yamaha's Yamalube, 2 stroke oil is a good choice.
Yamaha's Yamalube, 2 stroke oil should work pretty good
a good quality 2 stroke oil
any 2 stroke oil will do there all pretty much the same
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