i have run some pretty nasty oil ( one would think twice about putting it in a lawn mower) at 50:1 in my cr250 and it never had a problem. starts using castrol tts then elf which i felt was better. now i am using a shell product in my nsr coz it is cheaper and it hasent caused any hart ache yet but am running castrol rs in my kx125
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94 mc28 SE