Gas or oil out of exhaust

[Toyelectroman]

Recently i was running my 2017 Yamaha 115 on ear muffs in the driveway and after shutting down I could see a slight rainbow slick in the water on the driveway. Should I be concerned or is it normal?

 

[mike_i]

Should be fine, maybe what you see is from the exhaust and water mixture.

Recently i was running my 2017 Yamaha 115 on ear muffs in the driveway and after shutting down I could see a slight rainbow slick in the water on the driveway. Should I be concerned or is it normal?

 

[99yam40]

that 2017 should be a 4 stroke motor, so no burning of oil.
have you checked levels and condition of motor oil and lower unit lube?
also might want to look at your spark plugs to see if you see something different on one or more plugs