OK, I have an FA-82 on order for my next project.
I have already had some different opinions in a couple of posts but I will ask here.
What mixture do you like to run in your Saito 4 strokes for sport flying?

I run my 1.00 and 1.25 Saitos with 5% Cool Power fuel.

I run anything smaller with 10-15% Cool Power fuel.

I've never have had any problems with my Saitos, other than they tend to come set wrong out of the box.
Yet they tolerate VERY poor tuning and still fire up and run, unlike other engines.

I only use one fuel for everything, 15%. I was using Power Master with the blended 18% oil. I'm using Wildcat fuel right now but I may start using Cool Power, just depends on the price. I ran my own tests on Nitro content and tried everything from 5% to 30%, I used OS and YS engines. Other then a little more tuning on the low end they all worked pretty good in my four strokes. The idle was a bit rougher with the 5% but I'm sure if I spent a little more time on it that wouldn't be any problem. The few added RPM I get with the 20% and 30% isn't worth the added cost. They are easier to tune with a higher nitro fuel though.

15 % and 18 % blended oil
Thried some Patroit from Hobby Town and darn good stuff as I run it in all my of planes 2 stroke and 4s and small to large

You'll hear a lot of people say you have to use 30% helicopter fuel or some other voodoo brew but that's just throwing money away in my opinion unless you have a specific need to extract every last bit of performance you can. A good 15% fuel will be just fine. I run 15% in just about everything. Ilike Coolpower, mainly because it is readilly availble in my area.

You'd probably do just fine with 10% too.

OK and thanks for the replies. It appears that the common Cool Fuel works just fine.

Anything from 0% to 15% nitro will do, so long as you have 18% oil by volume, preferably a blend of synthetic and castor. All higher nitro content really gives you is more heat to dissipate.

I use Power Master 20/20. I have about 7 gallons left. I heard they are out of business now. So when I use up what I have, I will go to Cool Power, it is a great fuel also. Always add a little Castor oil, about 1 OZ, that brings it up to 20% oil content, which Saito recommends.

Interesting, our local shop has about 6 gallons of that stuff on the shelf.
But it looks like it's been there awhile too.

It doesn't go bad with age. If it's in a plastic jug sitting in the sun all the time it can have an effect over a lot of time. Power Master was always in cans.

What ever you do - do not punish your new Saito 82 with regular Cool Power. Four stroke Cool Power would be OK for it has some castor oil content.

The Omega fuel is OK.

Your fuel needs a little bit of castor oil in the mix. Use something that has a blend of synthetic oil and castor oil

8, I strated using the Wild Cat fuel at the moment, it is a blended oil. It is what Hobby People have started selling sense they no longer have Power Master. I have had warnings about the quality control on it but so far it is working pretty good. I just started using it so I can't say anything about the long term. It comes in cans too so storage is pretty easy just like PM fuel.

For two years I have been using Wildcat. I've used about 14 gallons. Prior to that I used Rich's brew for a couple years. Then 3 years using Omega then there were about 3 years using Rich's brew then Omega back in the 90's.

I like the Wildcat Premium Xtra and have been using 10 % nitro - 18% oil. I used 15% nitro in the other brands.

I have a couple cases of Wildcat 20-20 and it runs with a lot of power. No Castor oil just 20% synthetic.

Regular Wildcat Premium 10 or 15% nitro fuel just has 16% oil though. the ratio of synthetic to castor is 80/20

Omega and Rich's brew are 17% oil

The ratio of synthetic to castor in Omega is 70/30 and in Rich's Brew it is 75/25

I never had any bad fuel in any of these. It is a matter of availability and right place at the right time.

Regular Cool Power is OK if you put a couple ounces of castor in it.

Cool power four stroke has all the same ratios as Omega and runs good

Disregard, found the answer~</p>

That is exactly what I've found as well.

There is quite a hike in fuel prices going up to 15%-30% compared to the lower nitro contents.

Many of the magazines have gone into nitro requirements, and the findings are that higher nitro serves best on the fairly small engines. .40 and below.

I've only used Castor on an engine or two, where it was recommended for break-in.

Other than that I run all brands without it to good effect.

BTW: The articles also discuss that as displacement increases oil content percentage requirements are lessened and will even rob power.

I had a friend that no longer flew and he had gallons of different flavors under the bench he wanted to get rid of. Free fuel, no problem!! That was why I decided to do my own testing. I was always told that the high nitro fuels were made for those that didn't know how to turn the needles, seems there is a lot of truth in that. I did get more RPMs out of the 30% but the couple of hunderd wasn't worth the added price. The engines did idle better or were easier to adjust, again, at what price?? Maybe if I was flying pattern or something? The 5% did give a rougher idle and I didn't bother fooling with it. I ended up blending the 5% with the 20% and the engines were all happy with it. All I need now is some more free fuel or a really good sale. Brand to brand I haven't seen any difference either. I fly with four strokes in glow engines, a mix of OS and YS with an odd Saito tossed into the deal every so often. Don't you just love seeing how a YS just has to have 30% or they won't run. They did OK on the 5%, not as well as the OS engines but OK.

And even when you don't.

Regular Cool Power equals "Rust City" and bad bearings

But careful, Cool Power has expanded to different lube packages and some work very well like the multi vis versions

I just looked at the posters locations. Rust isn't a big problem for those of us on the left coast and pretty much not at all for those of us in AZ and NV. Rust requires moisture in the air. I think that's why Cool Power is used a lot here and no one is having a rust problem?? When I have seen people posting questions about rust and after run oil I always look to see where they live. I never add any Castor oil but I do like blended fuels with a little added in by the manufacture, I don't always run my engines dry or use after run so a little Castor my be another reason I don't find rust in my engines. Just another one of those little things to think about.

In my neck of the woods, humidy tends to be QUITE high throughout the year.

I run Cool Power on all of my glow engines. Some of these have been sitting for two or three years after their last runs.

When I went to check them out early this year, I found absolutely NO rust in the engines.

Glow fuel tends to inherently absorb water. Castor content has little to do with that.

If you leave fuel with water content in the engine, you are bound to get rust over time.

But that will happen with ANY fuel, no matter what you use.

This is not a characteristic of Cool Power or other synthetic oil fuels, as is being implied, but rather habits on the part of the pilot/owner.

That's true but for people that run there engines dry and store them they are leaving behind quite a bit of castor oil to help protect the engine during the storage. My problem with that is after a few years the castor hardens up and freezes the engine. Last week I just went through several old engines that were frozen up, just uesed the heat gun to get them spinning. Then I opened up the back plate and used straight alcohol and heat to flush them out. No rust at all. One 25 I put away over 4 years ago, one 35 three years ago and one 35 was given to me 5 years ago and I have no idea when it was flown/crashed? After I flushed them I used Marvel Mystery Oil and put them back under the bench for storage. I was impressed with how nice they looked inside. One of the 35s was run with cool power and the other two were run with Power Master so you may be correct, the cool power did just as good of a job with the oil it left behind. I have yet to run into a bad fuel or any that have done harm to my engines so price is a factor for me more so then brands and oil types. I just got used to the blended oils, maybe it's just an old habit??

It didn't inherit the acronym "Cruel Power" just out of the blue.

Morgan has made a lot of effort to make variations of Cool Power with blended oils to get away from the problem.

I've been running 4 strokers since the late 70's. For general flying 10% to 15% nitro works fine, anything more is a waste of money. During the warm weather I would add a ounce of caster oil to a gallon of fuel if it is not already in it. During cool weather I usually leave out the caster oil.