Patman
Staff member
Yes that’s correct however my personal issue isn’t about the oil that’s left behind, it’s what’s trapped in that used filter. New oil with the detergent package being at its best can loosen the trapped contaminants. Then they are in the clean oil. Why risk degrading the whole oil change trying to save $8?
I don't think it quite works like that though. Keep in mind, for many years Honda has specified oil filters be changed on every other oil change (that's what it said in my 2006 Civic's owner's manual) So it can't be that bad.