quote:Good point and it may explain why, for instance, Royal Purple 10w40 lists such a poor flash point. I always equated a high flash point with a robust base oil and maybe so, but if your point is the case, then a low flash point is not necessarly an indicator that the oil is not robust.
Originally posted by labman: I doubt flash point tells us much about an oil. An oil could have a low flash point due to a small amount of low boiling solvent used to carry in an additive. It would quickly, and harmlessly flash off into the crankcase ventilation. The volume lost would be negligible.