Biodegradable 2-stroke oil

Ronbedard57 · Nov 7, 2023

Hello all,
i ran with biodegradable 2-stroke oil in my 40hp '62 Johnson this year. Pretty crummy weekend weather, so I couldn't form much of an opinion. I really want this to work, as I'm conscious of the impact I'm having on the air and water. I figure I'm scoring a few points for running an antique motor on an antique aluminum boat rather than buying a new plastic boat with a new motor. "Use it up, wear it out etc."
Anyone care to share thoughts and experience? Is there a variance from recommended mix ratios?
Thanks
Ron

MrGiggles · Nov 7, 2023

It was my understanding that most, if not all modern two cycle oils are biodegradable.

airshot · Nov 7, 2023

At least they are far more biodegradable than the old 30 wt dinosaur oil !!

thill · Nov 8, 2023

Do you have a link to this oil? I am curious.

Having your engine running right, not too rich, and burning the fuel properly would be most helpful to the environment, regardless of what oil you are using.

If you have to add more of the eco-oil, you might be defeating the intended purpose.

Just because it's labeled as bio degradable doesn't say how LONG it will float around your lake before it breaks down. Even crude oil breaks down eventually, so that's kind of a catch.

Ronbedard57 · Nov 9, 2023

Hi,
The motor is always tuned pretty well, and I didn't really see any change in performance when I changed from the Wally-world stuff. Like I said though, the boat wasn't on the water very often this year. She's sleeping now, so I guess I'll learn more next season.
Thanks

airshot · Thursday at 9:03 PM

Can't complain about Wallet World oil, in my area, it is made by Valvoline and exceeds all mfgr recomendations. A few years back some independent test I g was done in my area on a variety of different oils and WW oil hung right there with the best. Neighbors belong to old car club clubs and many use WW lubricants with O issues.

Pappy · 2025-03-07T21:11:50-0500

BRP advertised one of their oils as biodegradable oil. There is now a label that "certifies" an oil as bio oil. Did some reading and stumbled on the Bel-Ray ad. Read the 3rd paragraph and see their description. Bel-Ray does produce great lubricants. https://www.belray.com/bel-ray-marine-lubricants
For the particular engine platform we are talking about I designed, tested, and have dozens of engines out and running with a simple Re-Circ system that pulls oil out of an engine drain and brings it back up to just behind the carburetor. Normally the drain simply allows the unburned fuel/oil to dump in to the water. This is normally seen as blobs that float to the surface and turn in to a sheen on the water. The re-circ system more completely burns the mixture.

FuzzyGrub · 2025-03-08T09:03:34-0500

Never heard of an oil recirc system. Cool!

Pappy · 2025-03-08T12:31:54-0500

FuzzyGrub said:
Never heard of an oil recirc system. Cool!

It recirculates the unburned fuel/oil that normally is just discarded overboard. Simple and works well.

Biodegradable 2-stroke oil

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