Just my 2 cents...yes to the Zip Loc bags...they have worked well for me anyway. I have several engines from my "first time around" in the hobby, that have been liberally soaked w/ either air tool oil, or ATF and put in the bag. They look great, and turn over good as new after almost 30 years...and the cabinet I keep 'em in doesn't get a puddle of oil in the bottom
(it did at one time though )