Long time reader, but first time posting. So I bought a filter cutter and decided to cut both my recent filters open. The M1-104A is from our 2015 Sonata, 3,500 miles, and looks good. The M1-301A is from my 318 and is complete junk.... Luckily I only had 500 miles on this filter but I'm still pretty pissed, and this will be the last Mobil filter I buy. Edit_ to add: That is the seam that is split open. There was sort of glued, but no metal clamp like the other one.
Last edited: