This is bargain brand 5w30 conventional SJ. Was cleaning garage and found a large cardboard box full - 20 quarts. Should I volunteer to do the neighbours oil change, or should I donate it to my mechanic, who will pass it off as generic oil and do a bargain oil change for a few customers. Or is SJ really better than SL because it has lots of ZDDP, so I should use it myself, first?