I've askd about mixing before and got the ok, but i'm not sure how far you can take this. What about mixing Torco blend with motul 7100 ester? very different oilds, tho both 20w50. It would be 4 quarts of torco and 1/2 quart of motul. I only would do this because my bike takes 4.5 quarts and i have a new gallon of motul 7100 i decided i don't want to use. So i figured i could just use the gallon to get that last 1/2 quart in instead of needing 5 quarts of torco. I hate to waste a $60 jug of oil. Yes/no?