I dont have a drain on the cooler....my concern was how much stays in the cooler and lines. I was hoping someone with a dual sump pan (factory on ford crate engines) would chime in and tell me how much
oil they put in when the change
oil and change filters....but its important they have a
oil cooler as well. 5qt pan, change filter and add a quart for that (6 total) and assume all oil in cooler and lines stays put??? is that safe????