4 stroke oil

Well there is a huge difference between 4 and 2 stroke oil.  A four stroke oil is designed to be cycled through the oil passages and galleys of an engine and by doing this is is supposed to provide a thin layer of oil between moving parts as well as suspend any dirt or moisture that has been introduced into the engine.  A two stroke oil on the other hand is meant to be injected directly into the combustion chamber to reduce friction and is designed to be burned cleanly as to not foul up plugs or cause any build up inside the engine.  Both oils are offered in crude and synthetic.  As far as a 4 stroke oil that goes into your boat or that goes into your car, no difference what so ever, both are 4 stroke engines that operate on exactly the same principals.

So I could buy regular oil and pay 3 bucks a quart verses 7 something because it has the four stroke lable on it?

I would run Shell Rotella 15-40 in my four stroke engine.  This is probably the best all around oil made.  I run this in my kids four stroke motocross bikes.  You can't put an engine through more punishment than what a motocross bike goes through.  These four strokes reach rpm's of around 12,000.  Rotella works awesome in it.  And thousands of people throughout the country are using it in their race bikes.  It would be a great oil for your 4 stroke outboard motors.  And it is very reasonable.  And readily available at nearly every gas station in america.  I run it my Yamaha 115 four stroke and have for several years. 

huntingdad Said:
So I could buy regular oil and pay 3 bucks a quart verses 7 something because it has the four stroke lable on it?

huntingdad,

Unless you are a person who puts hundreds of hours on his 4-stroke (I assume boat motor) a year, you can just buy any high quality automotive oil brand that you like.  I am fairly sure when buying yamalube, or Merc's quicksilver 3-stroke oils you are buying the name more than anything else.

3-stroke oil?  That's something I have never heard of before.  Should read "4-stroke".

Allen,
 
3 stroke is half way between the 2 and the 4.  Some gets burned, while some gets circulated.  Actually best of both worlds.

 

luveyes Said:
Allen,
 
3 stroke is half way between the 2 and the 4.  Some gets burned, while some gets circulated.  Actually best of both worlds.

Chuckle