While we are on the subject of oils, I see a lot of questions regarding "Ratios".
Please remember two things:
1.) When you reduce your oil consumption, (Ex.: going from 30:1 to 100:1) you are also reducing the amount of detergents exposed to the moving parts of the engine. This is also a part of the oil that makes it more expensive. Use it to your advantage.
2.) When you reduce your oil consumption, (Ex.: going from 30:1 to 100:1) you are also "richening" the mixture.
Lot of people have this backwards. Remember the opposite it true, also. Going from a "properly" tuned motor at 100:1, and going down to 30:1, thinking you're going to do something
nice for your motor, might actually be doing more harm.
Redline can be run at 100:1, just like Amsoil, but why would you do it. For our low RPM motors the HP gains are minuscule.
I'll admit, I used Amsoil Sabre 100:1 in my younger years, ever since it first came out (before Redline Karting Oil).
It was the best thing, next to sliced bread, if you know what I mean.
Having worked in a small engine shop early on, we knew we had to re-tune for it, and we did, and had good results.
Here are my thoughts on the Amsoil situation some people are seeing with their aircraft motors.
Referring back to #1 & #2 above:
My guess, and this is just a guess, is that most who have tried to run Amsoil, was previously using another brand, at say 30:1 to 50: 1.
They heard there was an oil out there that can be run at 100:1 and the motor will have more HP and run cleaner.
We all want that, right? Oh, and reducing our oil consumption in half, save you money, a Win - Win - Win, right?!?
Here is what I think happened next; They mixed up their next jug of fuel at 100:1,
didn't re-tune, noted that the engine ran just as cool (a "Rich" motor usually does), and went home feeling great about saving a few bucks, too.
Couple years later, after running a "Too Rich" motor, and reducing by volume, 50% of the available detergents, the motor now has carbon and soot built up everywhere. The "Richness" just added to the carbon fouling, and the reduction in fluid volume/detergent made it impossible for the oil to keep up (self-clean).
Once again, just a guess, right!
When someone asks me whether to run 40: or 50:1, I ask them the following questions:
1). You looking for more HP?
Ans: You probably won't be able to see it, or feel it.
2.) You looking for less mess?
Ans: You probably won't see a difference. There is only .16 oz difference in a typical 32oz tank.
3.) You don't like all that "black crude"?
Ans: You prefer suit and carbon? When you see black, it means the engine is self-cleaning.
Or, you can just run at 20:1, then it will turn pinkish
)
4.) You must like calculating mixing ratio's and measuring (aka: You must got "one-ub-dem-thar" Smart Phones thingy's)?
Ans: Just dump a 16oz. bottle in a 5 gal jug and leave the measuring beaker at home, so we have more time to FLY.