Why some Suzuki motorcycle engines use oil for engine coolant?

I'm curious why some Suzuki motorcycle engines use oil only for engine coolant? Seems like a good idea - one less engine plumbing system to worry about. Why hasn't other manufacturers follow suit? What's the pros and cons?|||To a greater or lesser extent, oil is part of the cooling system of every motorcycle. Suzuki uses a spray of cool oil to the underside of the pistons to help keep them cool, and on some bikes, a larger than normal oil cooler. It is still basically an air-cooled engine. In contrast, a liquid-cooled engine has a water jacket that circulates coolant around the cylinder and head.





An air (or oil-) cooled engine is typically simpler and lighter than a water-cooled engine. A water-cooled engine is able to main greater dimensional stability of crucial engine parts, and can therefore operate at closer tolerances, and with less loss of power when hot.|||We call those bikes air cooled not oil cooled. Even if they have a oil cooler they are air cooled. A good example of this is BMW R bikes and Harley's. Most manufactures have air cooled and water cooled bikes. It is much easier to get higher compression ratios and less emissions with water cooling. Personally I like both :)|||The pro was that oil got to the hottest parts of the engine directly. The con was that it heated the oil.