Ive seen test of motor oil, where the oil is rated at a given weight (Ex. 10w-30), now they take a name brand oil, and a "bargain" oil and run them thru a use cycle(maybe 3000 miles) and remove them and test. The data i saw was remarkable, the name brand(it was penzoil) came out with a 10% varience(9w-27), the "bargain" brand was 40%(6w-18). Personally, it seems to me that there is no BARGAIN in "bargain" oil. I have also seen people send out oil if there is a question, we do it where i work to verify they are not ripping us off on quality of oil( i work maintaining a fleet of heavy equipment).
I own a Polaris 2-stroke, and all i can say is you cant go wrong with the Polaris oil. I tried Bel-ray and was not happy, not only did it smoke more, but it also fouled my plug(i did use the oil for injection). Id go with the Polaris stuff, at $8 a quart it is a "bargain" if you ask me.
While we are dropping acomplishments..
ASE Master tech since 1994
ASE Heavy/Med truck Certified
NJ Licensed Diesel Inspector
NJ Licensed Emission Inspector
NJ Certified Emission Repair Technician
Iv only been doing this for 15 yrs...so im still a youngin..LOL