92 johnson 25 hp oil mix

[youngun1916]

I have a 1987 25 which takes a 100:1 oil/gas mix what will the 1992 25 horse require?

 

[HybridMX6]

Re: 92 johnson 25 hp oil mix

I'm guessing on this, but I don't think the 1987 needs 100:1 mix. I had a 1978 35hp that I ran on 50:1 and all was good. I don't believe OMC motors have required 100:1 mix for a very long time. It's not going to hurt anything, just over-lube it and the carbon may build up faster than normal.

 

[Harker]

Re: 92 johnson 25 hp oil mix

A 100:1 mix has 1/2 the oil as 50:1. I would run 50:1 in both.

 

[Vic.S]

Re: 92 johnson 25 hp oil mix

The 1992 engine will require 50:1, using a TCW3 oil. 1 pint in 6 gallons is near enough.

The 1987 engine should also be using 50:1.

OMC attempted to switch to 100:1 in 1985 but few years later advised that all engines supplied during that period and subsequently should in fact be run on 50:1.

All decals relating to 100:1 should have been removed and operating instructions amended accordingly

Running 100:1 means the engine will be UNDER lubricated.


Before 1964 engines used more oil in the mix usually 24:1

 

[HighTrim]

Re: 92 johnson 25 hp oil mix

Any motor '64 and newer uses 50:1, for non race purposes of course. The 100:1 mixture was changed by Johnny/Rude, so be sure to change your pre mixing on that motor.

http://www.evinrude.com/en-CA/About.Us/FAQ/Oil.Fuel.htm

edit: Sorry Vic Im much too slow

 

[youngun1916]

Re: 92 johnson 25 hp oil mix

Thanks for the info