http://www.westmarine.com/webapp/wcs...key=SiteSearch
Click on the above link...look it over and for $3.49 it'll save ya a LOT of grief and $$$...
Like Therm said, the gears that move the oil in that system are PLASTIC and WILL FAIL in time...when they do, as he said, you just TOASTED yer motor and everything else you did to it just went out the window...not to mention the problem you may encounter by being at sea far from the ramp W/ 3 KIDS when the motor goes "snap-crackle-POP!!
Not having to mix oil in is a convenience, no doubt, but the little bottle above makes it a no-brainer and EASY to do...trust us on this one...