too much oil

[aalleexx]

I have an '88" 15 hp evinrude. the recomended mix is 50:1 according to the manual. What is the worst that can happen if I put more oit than the recomended. I was told that it was good to always put a little more out than the recomended. (instead of 50:1 I am putting 40:1) <br /><br />Can I blow the engine if I put too much oil?<br /><br />or what happens if I put too little?<br /><br />thanks

 

[ED21]

Re: too much oil

It won't hurt, but I wouldn't bother. It isn't needed. More smoke, more fouled plugs, more carbon buildup.

 

[rickdb1boat]

Re: too much oil

If you put in too little, bad things will happen. Your engine depends on this mixture to lubricate properly. Do not deviate from it. Run 50:1!!

 

[dajohnson53]

Re: too much oil

I've run a lot at 40:1 without noticable plug fouling or other problems - other than possibly more smoke. I do believe that anything more than 50:1 is wasted, but I also believe that it is pretty much harmless to mix a little too much oil - and much better than erring on the side of too little oil. So that's what I do - shoot for 50:1, but don't sweat it if it happens to be closer to 40:1 from time to time. <br /><br />Just for example, oil is marketed in quarts - which for 50:1, gives you increments of 6 (1/2 qt) and 12 (full qt) gallons for mixing. Mixing the same amount of oil for 5 or 10 gallons gives you 40:1. Therefore, when I top off my built in tanks, I use the same amount of oil whether it's 5 to 6 gallons; 10-12, 18-20, etc. I don't bother measuring any closer than that. Makes it simple and safe (in my opinion).

 

[walleyehed]

Re: too much oil

The more oil you run, the less fuel you have per given volume, creating a leaner fuel burn, higher temps, as a result, hard carbon build-up follows-don't deviate from the recommended mixture.<br />Just in case, the Wiseco piston P/N is 3036.<br />Oh yea, I forgot to mention the high resistance created by the oily plugs requiring several thousand volts more to fire the plugs, shortening the life of the ignition system.....