Reading through this thread was very entertaining. As usual the guys who boast about knowing the most are the guys with the least amout of experience. Comments like " Oil does nothing for cooling " and " nitro aids cooling " are absolutely ridiculous. One comment about the oil coming out of the exhaust would burn his hand is correct. Why? Because the oil is absorbing heat....duhhhhh. As for nitro, last I heard nitro is an oxygenator, add oxygen to flame and it gets hotter! Another Duhhhhhh. As for castor oil, if you are happy using it, good for you but don't try to convince anyone it protects better then straight synthetic. That may have been the case 30 years ago but not today. Example, both I and Airrsptor run engines with as much as 60% nitro on straight synthetic and experience no issues doing so. We have been doing this for several years. We are running YS 115 engines with 14x14 props, If anyone has this level of experience with that much nitro and that much load that can conflict our findings then please let us know otherwise your opinion is just speculation. Comments about car engines need not apply.