Originally Posted By: volk06
Mobil 1 is a synblend media, not full synthetic.
Is that true for the can filters too? For a long time, most companies outsourced the cartridge filters to Mann, Hengst, etc. since they had no means for producing cartridge filters at an acceptable cost, and hadn't made the investment in them yet. So you had all sorts of oddities between packaging and what was inside-- IE, a Fram box with a Mann filter (just an example, not saying that example is accurate.)
edit-- I see on Mobil's website, their oil filter line is advertised as semi-synthetic.