Yep. Often, I re-use the filter, mostly on dino apps where oil is changed at 6000-ish miles....especially on MiL's car where I am not re-embursed. I just did it on my 2006 Acura, drained and re-used the M1 filter....with M1 oil changed a lil early this time at 6000mi. Since I have the option of $2 ST filters on that car, and I am using synth exclusively, I will not reuse the $2 filter with $30 worth of oil. I do drain them well if they are to be re-used, especially the big Audi filters. Maybe that is part of why Honda went to the lil-guy lemon sized filter, less oil left behind in it if the crankcase is drained.