Posts: 3472
Location: Elk River, Minnesota | Depending on the 4 stroke engine you go with, cost will vary for oil and filter, but in the end, it most likely is a wash to maybe...maybe a little savings with a 4 stroke.
Smoke-wise...on the new 2 stoke direct injected engines, Smoke is almost non-existent because the synthetics they burn have been formulated to burn clean, and as technology continues to improve, less oil is needed.
I run a 150 2 stroke that has a 2 gallon oil reservoir. I fill it before a week trip to canada and run all over....not anywhere near the 600 or so miles Brad Nelson might put on his rig...and by weeks end, I can fill it with about 3/4 gallon. I don't run wide open, and I don't troll with it in Canada, so a gallon goes a long, long way. The giddy-up of my 2 stroke over the equivalent 4 stroke is great, and cost-wise...the same or less because I don't burn through a ton of gas. on a 4 stroke, oil is changed yearly. I don't need to do that... I just need to fill up a reservoir and go fishing. And...I have a nice little spot next to the reservoir to keep an extra bottle and funnel...most boats will have this kind of room. Topping off a reservoir is less than a 5 minute job... and a gallon of oil takes up very little space. So...(poking fun here...) you-all with 4 strokes, enjoy your time draining, filter changing, and filling. I'll be on the water fishing your spots. 
I feel your mind is made up nomad....the 70hp Yamaha you have decided on will do you well. Now...just go get the darn thing and enjoy it!!
Steve
Edited by VMS 2/15/2019 12:32 PM
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