Gas and fuel mix recommendations for JW-10

[M1aTom]

Hello, my first post here about my Johnson JW10 3hp.

I just purchased some Pennzoil TC-W3 oil and I’ve been reading some people are using a 24:1 ratio while others are using a 16:1 ratio blend. What are your recommendations between those?

I also have a question about what fuel I should purchase, I can obtain non ethanol fuel at 91 octane near me. Is that okay to run in these old engines? If not what else would be preferred.

Thank you.

 

[alldodge]

This older thread list 24:1
https://forums.iboats.com/threads/fuel-mix-in-old-johnson-3hp.211119/

 

[M1aTom]

So ethanol being in the fuel likely won’t damage anything in these older outboards?

I saw in that thread that 87 octane is okay but nothing about it being ethanol free.

 

[alldodge]

I'm no expert on the old OB motors (hope to see some of those folks chime in) but do know that ethanol is bad for the old I/O's. 91 octane gas won't hurt the motor but you may have slightly less HP. The higher the octane the slower the gas burns

 

[M1aTom]

Well I just came across a marina I forgot about on pure-gas.org that’s within a 20 minute drive of me that Carrie’s 87 non ethanol so I believe I found what I am looking for.

Anyways, alldodge, thanks for your help!

Happy to have found this forum it will be of good use to me I’m sure going forward as I believe many parts can be found for the old JW10 for sale on this site.

Thanks again!

 

[JimS123]

If you have replaced the fuel lines and the float in your gas tank E10 will be OK. If you by non-ethanol, take your chances. It ain't all true. Some stations lie. Best to be prepared.

 

[jimmbo]

I would go with 16:1 on that Motor, not one Anti Friction Bearing in the Powerhead, it Needs all that Oil to stay alive

 

[lindy46]

I run 16:1 in the 3hp J/E motors from the 50's and 60's. I always use 100 percent gas in my old outboards .