Amsoil recently released a new formulation of all of their street use oils that render those vapors non-explosive. So far in their testing (and they do extensive testing) it has eliminated most or all of this issue. M1 may be following as well with a new formulation. Of course a proper dual valve catchcan system that pulls evacuation at all times will eliminate most of this as well as it is constantly flushing and evacuating all vapors from the crankcase.
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