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1971 Evinrude 25hp outboard #4756287
05/13/18 07:38 PM
05/13/18 07:38 PM
Joined: May 2011
Posts: 1,061
Greenville, SC via Chicago, IL
dja4260 Offline OP
dja4260  Offline OP
Joined: May 2011
Posts: 1,061
Greenville, SC via Chicago, IL
My father was kind enough to allow me to use his spare aluminum 14 ft boat and 1971 Evinrude 25hp outboard. The boat has a full floor and inboard steering. I'm excited to take my 2.5 yr old and wife out on our local lakes and do some camping on remote locations.

I know that I have to run ethanol free gas but what type of oil? I know that TC-W3 is the certification standard.

I have a lot of options!


2013 Hyundai Elantra Gt Hatch 6 spd
2005 Toyota Highlander V6
1997 HD Sportster
Re: 1971 Evinrude 25hp outboard [Re: dja4260] #4756298
05/13/18 07:46 PM
05/13/18 07:46 PM
Joined: Sep 2014
Posts: 1,504
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline
Joined: Sep 2014
Posts: 1,504
Toronto Canada
I have an old Johnson outboard that I run no name TCW3 oil in and I run any gas I can find. Never had a problem.

Re: 1971 Evinrude 25hp outboard [Re: dja4260] #4756304
05/13/18 07:49 PM
05/13/18 07:49 PM
Joined: Mar 2004
Posts: 21,319
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 21,319
Upstate NY
You can get TC-W3 at Walmart. Even the Supertec brand will be fine. Make sure you know the ratio. I am assuming this has the 6 gallon tanks you premix the oil and gas. I am thinking its 50:1. But that old could be less, maybe even 25:1.

I do not think E0 is required, but certainly a good idea if available.

I would have a handheld VHF radio with me. Basic safety.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: 1971 Evinrude 25hp outboard [Re: dja4260] #4756413
05/13/18 10:46 PM
05/13/18 10:46 PM
Joined: Aug 2005
Posts: 88
southeast texas
meadows Offline
meadows  Offline
Joined: Aug 2005
Posts: 88
southeast texas
50:1

Re: 1971 Evinrude 25hp outboard [Re: dja4260] #4756521
05/14/18 05:26 AM
05/14/18 05:26 AM
Joined: Sep 2016
Posts: 170
MN
Tman220 Offline
Tman220  Offline
Joined: Sep 2016
Posts: 170
MN
The mixture on that outboard is 50:1. The only time ethanol was an issue was when the carburetor floats were made of cork, but its very likely sometime in the last 47 years that the float has been replaced with plastic.

Don't overthink the oil. Just find any TC-w3 oil and rest easy knowing that ANY TC-W3 oil available today is loads better than anything available when that outboard was built.


2012 Regal GS Turbo PP 5w30
1994 Camaro Z28 LT1 355 CI, 430 RWHP PP 5W30
Re: 1971 Evinrude 25hp outboard [Re: dja4260] #4756540
05/14/18 05:41 AM
05/14/18 05:41 AM
Joined: Aug 2003
Posts: 13,218
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,218
NE,Ohio
Just grab some inexpensive tc-w3. IIRC pennzoil was around 14$ a gallon
run it 50:1.

E0 is not needed but very recommended.


2019 Jeep Cherokee Trailhawk 2.0T
Re: 1971 Evinrude 25hp outboard [Re: dja4260] #4756600
05/14/18 06:41 AM
05/14/18 06:41 AM
Joined: Sep 2015
Posts: 1,630
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,630
USA
There is also gear oil in the lower unit. It should be changed yearly to avoid water buildup.

Older models have a shear pin that uncouples the prop if you hit something solid with it. If yours is like that, carry spare pins.

Re: 1971 Evinrude 25hp outboard [Re: dja4260] #4756664
05/14/18 07:42 AM
05/14/18 07:42 AM
Joined: Sep 2004
Posts: 7,902
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,902
Marshfield , MA
LIFE JACKETS esp, 2.5 yr old. Granpa should be giving a well maintained boat for G'baby. Oars!


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: 1971 Evinrude 25hp outboard [Re: mk378] #4757108
05/14/18 03:20 PM
05/14/18 03:20 PM
Joined: May 2011
Posts: 1,061
Greenville, SC via Chicago, IL
dja4260 Offline OP
dja4260  Offline OP
Joined: May 2011
Posts: 1,061
Greenville, SC via Chicago, IL
Originally Posted By: mk378
There is also gear oil in the lower unit. It should be changed yearly to avoid water buildup.

Older models have a shear pin that uncouples the prop if you hit something solid with it. If yours is like that, carry spare pins.


Yes, this unit has a shear pin. I'm going to carry a few spare! My father and I have already had that discussion.

I bought a gallon of Pennzoil ZTF2-stroke oil.


2013 Hyundai Elantra Gt Hatch 6 spd
2005 Toyota Highlander V6
1997 HD Sportster
Re: 1971 Evinrude 25hp outboard [Re: dja4260] #4759385
05/17/18 12:32 AM
05/17/18 12:32 AM
Joined: Mar 2016
Posts: 83
iowa
sh40674 Offline
sh40674  Offline
Joined: Mar 2016
Posts: 83
iowa
i like pennzoil


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