A little off-topic, but I'd like to warn about the low-viscosity Klotz 189 Heliglo (Not the 198 Lite Techniplate that Brett mentioned).
I was very excited about it first, but after burning about 2 gallons of it this summer, I found out that it leaves a massive amount of enamel like, glass-hard residue in the plug and combustion chamber, and to top of piston & baffle. My guess is that it's coming from some anti-foam additive that helicopter people seem to love.
Some sources say that the 198 is the same oil but without or with less of that additive. But it's difficult to find reliable info.
I'd also like it without the red dye, but with a proper clear coat it's not a problem.
I have some experience with Klotz KL-189.
Some years back I noticed it was leaving a sort of chalky red deposit in the engine.
Then the guys down under started screaming about 189 causing engine damaging deposits.
At that point I stopped using it....I had a couple of gallons of it but only used one of them.
A little later I bumped into John Klotz at the Pasadena California model show and I asked him about the 189 oil.
Without hesitation.....he said that there had been a technical problem with that oil and asked me how much if it I still had.
He asked for my address and asked me what oil I would prefer as free replacement. He said to toss the 189...which I did!
I went back to the original Technoplate I had been using since the mid 60's when Clarence Lee made some comments in RCM.
The replacement gallon arrived in a week or so and I never used KL-189 again.
Some of the guys in the Los Angeles area....including me....had been buying K&B X2C out the back door when K&B was still in Downey, Calif at their original location.....bring your container or buy a K&B metal can for $1 and they would fill it up for $8 per gallon.
I was living nearby at the time so I would take several gallons to contests for friends that had called.
In the end.....I still have about 4 gallons of X2C....no dye....and it works well.
A couple of years ago I had a phone conversation with Clarence and I asked him what X2C REALLY was.
He said it was UCON 1145 and to be careful with it because it burned at 430 degrees F which is lower than modern oils.
It has been discontinued for many years now and I expect I am the only dummy that still has any of it.
It works well in the GMA configuration but I have never tried it in the ROJETT.
I have some CoolPower 30% Heli fuel that I cut to 10% and add Technoplate to get it to the ROJETT blend.
Brett....I have no doubt that RO had a green deposit in the engine.....what ever is in that Mean Green stuff and 189 ain't no joke!
Bottom line.....don't use KL-189 and as soon as I use up the last of the Technoplate....KL-200 I think......then I'll change to 198.
Guys around here are using 198 with success and no red deposits.
In fact....I am 3rd owner of a ROJETT SE 61 that originally belonged to RO then sold to another guy who flew the crap out of it using 198. When I got it from him I looked inside and it was squeaky clean....no deposits.
Well....I lied...it only squeaks at TDC!