Originally Posted By: Cujet
Contrary to popular opinion, more oil makes more power (properly jetted) and more oil produces less carbon.
As far as synthetics producing fewer deposits, that is sometimes true. Especially when it comes to "power valve" deposits.
However, in test after test, the very best oil for deposits was conventional Pennzoil 2 cycle oil.
http://www.ultralightnews.com/features/oiltest.htm
However, I'm not sure the classic Pennzoil 2 cycle oil is still available. There were some reports that the formulation still remains available, but I'm not sure where.
Just remember, wear rates and carbon deposits are not equal parts of the same situation. That Pennzoil 2 cycle oil is wonderful in low stress engines, but falls quite short in 55HP Kart engines, where Motul 800 does far better.
Cujet, you have pretty much summed up my #1 issue with Amsoil. In order to stay competitive they feel they need to push the thin oil ratios for their oils. Then comes the fact that Amsoil oils are not certified, at least not the 2 stroke ones. But don't ask the many fanatics who sell the stuff, because they will tell you about the "extensive testing." I have yet to see an article of amsoil's testing of their oil. I should just stop before I get a headache. I'm not sure what to call amsoil. They are not really scamming people, its not a pyramid scheme. They are snake oil salesman.
I have never seen a test where more oil produced less carbon, but I have never seen a study where it produced more either. I have seen 3 dyno tests that tested oil ratios. All three found somewhere around 15:1-20:1 to produce maximum horsepower in 2 stroke engines. j
A synthetic oil is not man made, it is synthetically modified oil. It is more or less highly refined versions of "dino oil." The base oils are of better quality, and there are generally more additives.
I don't think pennzoil makes the same oil they did years ago. I think sometime around the early 2000's they were bought out, and I have heard they changed formulas. I have not used the older stuff. From what I hear, the old kind was green, and this new stuff is blue. You can still buy the air-cooled version, but it has not been listed on their website any time I looked. Instead it looks like they changed the name to multi-purpose. I'm sure its good oil, I have never tried it.
Motul makes some very good oil, and I used to run their 700. If I was in need of the very best protection, I would look to castor oils. From what I have seen Castrol A747 will handle the worst punishment. While castor oils provide incredible protection, I don't like their disadvantages. The main one being that it will separate from the gas rather quickly.
I'll stick with my fully synthetic oil. At my bikes last rebuild after god knows how many hours of riding, there was still cross hatching on the cylinder, no marks on the piston, and it still ran good. Everything was sparkling clean other than a thin strip of black across the top of the piston.