2-Stroke Oil Mixing Question.

[Salmonseeker]

I was just thinking how 2 stroke oil is able to mix perfectly with gas when you premix.

My question is, Will the oil always be diluted with the gas at an equal ratio? Or will some gas contain more oil than other gas in the same tank?

Also when a premix tank is left to sit for a while. Will the oil settle or will it stay equally mixed? I know you should shake the tank before using it. But what about a boat that sits in the water with a permanent tank. Say it sits a month between trips. Will the oil still be equally mixed with the gas?

Thanks in advance

 

[Silvertip]

Re: 2-Stroke Oil Mixing Question.

Yes -- No -- Mixed -- Yes. You worry too much! d Ten feet after you move the boat if there was any separation it will be mixed again.

 

[kenmyfam]

Re: 2-Stroke Oil Mixing Question.

The oil is soluble in the gas. As Silvertip says even if it gets out of sync ratio wise in there the first slosh around the tank and its mixed again. None soluble oil will seperate and that is one reason for the development of 2-stroke oil. Just make certain that the mix is correct.

 

[Salmonseeker]

Re: 2-Stroke Oil Mixing Question.

Thnaks, guys.
I know I worry to much.

 

[kenmyfam]

Re: 2-Stroke Oil Mixing Question.

If you dont worry at all then you can land in trouble. Always better to ask. I ran a 2 stroke motorcycle back in England with regular motor oil when 2 stroke oil was hardly available in the mid seventies oil crisis. Worked just fine but i sloshed the cycle from side to side each time before I started it. Had no issues at all.

 

[DJ]

Re: 2-Stroke Oil Mixing Question.

I have had/have both, oil injected and mix.

For the "mix" units I do this.

Pour the oil in the tank and fill with gasoline-forget.

TCW-3 oil stays mixed-forever, from what I can tell.

 

[artherm]

Re: 2-Stroke Oil Mixing Question.

If you dont worry at all then you can land in trouble. Always better to ask. I ran a 2 stroke motorcycle back in England with regular motor oil when 2 stroke oil was hardly available in the mid seventies oil crisis. Worked just fine but i sloshed the cycle from side to side each time before I started it. Had no issues at all.

 

[artherm]

Re: 2-Stroke Oil Mixing Question.

I believe if you look at some of the early OMC outboard motor manuals of the 1950 engines running 24/1 ratio's, you will find that they state it is ok to run 30W. automotive engine oil as a premix.

 

[jimmbo]

Re: 2-Stroke Oil Mixing Question.

To quote a 1957 35hp owners manual: "We reccommend a reputable SAE 30 outboard oil, or a regular SAE 30 grade automobile engine oil (not heavy duty). Avoid use of low-priced third grade (ML) oils."

The auto oils of the 50s are a far cry from what is availible today. These oils, unlike todays auto oils were non detergent oils. As detergent oils became more prevelent in the early 60s more and more oil related failures became commom. This and the fact not all brands of 'outboard motor oil' were up to snuff the outboard manufacturer brought out oils that were made to their specs.
Unlike oils that meet the tc-w* spec, to burn with minimal deposits and reduce existing deposits, modern 4 stroke oils have additives that are designed to inhibit mixing with gas they also loaded with detergents that will not burn clean, leaving deposits to build up.
I guess if you get some SAE30 non detergent oil it still would not have the additives needed for use with todays fuel and newer engines.