Mix a bit of used motor oil with it (I'd guess that you change your motor oil at the same time you do your hydro), call it "used oil", and you're set. No lying involved.
LOL, I see repeats of my posts all the time, I figure folks must just skip over my posts and post similar thoughts. Sometimes it's the very next post!
Whats that saying about like minds
Course I'm probably as guilty as the next, so it don't bother me none