I'm with Pe 100% on his views. I also don't believe for a moment that any engine manufacturer deliberately leads their customers astray. Simply put, they may not be performing oil testing when they are testing their engines. What they are interested in are engine performance levels, possible maintennance issues, parts reliability, and general lifespan. Testing the lubricity of the oil at a specific ratio is just not what they are in business to do.

There are quite a few people that visit this forum that have the opportunity to view the results of extended engine run times and are able to compare wear patterns developed over thousands of running hours with different oil types and ratios. Their business depends on the ability to keep the engines airborn and running safely and efficiently for long periods of time. There's a big difference in what they experience and what a manufacturer sees simply because those users place more time on engines than the manufacturers.

Most r/c engines run for 15 minutes or so at a time. It takes a whole bunch of 15 minute runs with teardowns in between to determine what will work best in the long run. A couple of people that you can trust to always steer you in the right direction in this forum are Pe Reivers and RC Bugman. They both put a lot of hours on engines and take the time to dissassemble them to examine the results of the products used.