I'd like your impressions about how many miles a given filter is good for. My car uses the canister types. IMHO for my driving environment it would go like this, and some of these filters will do for two oil change cycles, and oversized filters might last a little longer in some circumstances: 5000 to 6000 miles - Basic filters from STP or Fram, such as the Orange Can; also Supertechs. 7500 miles - Fram Tough Guard. 8000 miles - Wix, Napa; standard filters. 15000 miles - Fram Extended Guard 7500 miles, possibly 10000 - Toyota original equipment filters. 8000 miles - Bosch premiums 15000 miles - the top filters from Bosch, Mobil, Royal Purple. ? - Amsoil filters and some other high-end lines. What is your take on the filters you know of?