I've been using 10W40 or 10W30, but I've noticed Wal Mart has 5W30 cheaper than other viscosity.
My user manual do list those first 2 on a graph showing when to use according to ambient temperature, but it doesn't mention anything about 5W30. Does 5W30 mean more versatile than 10W30; meaning it has same rating for high temperature has 10W30, but can work in lower starting temperature han 10W30 can? Is it safe to use 5W30, 5W20, etc on my bike as long as they meet required API grades?
I don't want to hear preaching like that I should use motorcycle specific oils, I should spend fortune on oil, yadda yadda. I've been using car oils, and have put almost 200,000km on multiple bike with no issues. I'm asking this question to Kawasaki, but I also wanted to hear how they work in real life.
I was reading Wiki. I didn't find an answer for my question, but I learned something interesting: http://en.wikipedia.org/wiki/Motor_oilIn the 1970s typical cars took heavy 10W-40 oil. In the 1980s 5W-30 oils were introduced to improve fuel efficiency. A modern typical application would be Honda Motor's use of 5W-20 viscosity oil for 12,000 km (7,500 mi) while offering increased fuel efficiency. Due to many new engine designs having tolerances of a few one-thousandths of an inch, advanced oil-actuated cam and valve timing systems, many manufacturers are recommending an oil weight of 5W-20 to be used in their engines.Synthetic lubricants were first synthesized, or man-made, in significant quantities as replacements for mineral lubricants (and fuels) by German scientists in the late 1930s and early 1940s because of their lack of sufficient quantities of crude for their (primarily military) needs.