I've done plenty of oil analysis tests on many engines for many years running all types of oil. When you see the results Amsoil does not perform better than other high quality oils. Redline, Motul, Maxima, Torco and many others are just as good as Amsoil. Oil types are based on formulations, additives and base stocks. There are no secret formulations only different formulations using different blends. Amsoil will not even publish their base oils they are using. Polyol Ester synthetics used in both Motul and Redline are known to be the best available as far as temperature stability and being naturally multi-viscosity. I don't want to develop a new oil thread here as those just get ridiculously out of control. Run what you like that meets the spec. The R18 is not a highly stressed engine, it will last a long time, I'll leave it at that.