whats the difference between 2 cycle motor oil and 4 stroke motor oil and what are the consequences of adding 2 cycle oil in a 4 stroke? stupid question but just curious someon throw some knowledge at me!!

 

I can give an opinion, but it's not based on anything other than conjecture. 2 cycle oil is designed to be mixed directly with gasoline. 4 cycle is not. I would think that the additive packages would be different based on the environment that they are designed to work in. 2 cycle oil tends to be thinner than 4 cycle oil, so if it were put into a 4 cycle engine, it may not provide the protection that it needs. I don't have anything to support any of these statements though .

 

Thats what I was thinking just wasnt sure. I was curious cuz a buddy of mine just got a 2001 R6 and he mentioned that he changed the oil but when i was in his garage i noticed he bought amsoil synthetic 2 cycle oil! I just thought to myself.... thats not good!! but thanx for the response

 

2 cycle oil is for things like chainsaws, weed wackers, and other two stroke engines (like dirtbikes). Tell your moron buddy to change his oil before he blows that thing up. lol

 

Sooo... I had this big long explanative reply and the internet crapped out and it didn't post it. So now I'm just gonnna summarize it.

In my 15 years of working with 4 and 2 stroke motors, this is what I've gathered.

2 strokes are "inefficient" with oil because they burn it. Because of this, you want almost no by-product when it burns. On some 2 cycle oil you will see the word "ashless". If you burned 4 cycle oil in your 2 cycle motor, it would gum up the rings, valves, exhaust, etc and eventually destroy your motor. Because it's meant to be burned, it is kind of a "one time use" oil. I believe the thermal breakdown and the protection factor is significantly lowered after 1 cycle through the engine.

If you run 2 cycle oil in your 4 cycle motor, it will be "fine" for a little while. Once it starts to breakdown though, you will lose protection and you'll F your motor. Drain it ASAP and he should be fine in that category. This being said, I have NO IDEA what 2 cycle oil would do to a wet clutch. That's what I'd be worried about the most.

 

When you say 2-stroke oil are you saying pre mix? Man, I don't think I would run it very long in mine!!!! I couldn't imagine running Maxima 927 in the crank case/gear box!! Nasty stuff!!