r50 is the synthetic klotz. i like the technaplate alot better but if i was running the r50 you would probably have better results with the tried and true 40-1 instead ,see the synthetics have a high flash point and are designed for the higher ratios .the technplate is semi synthetic and has castorburns clean and protects it works fine at lower ratios like 28-1 or 32-1 .personaly I like more oil mixed if possible ,never seen an engine get ruined from too much premix oil but i have seen the opposite quite a few times lol