So, to refresh this thread, I stumbled upon something interesting.... I picked up a NAPA Platinum (Wix XP) oil filter as I was buying a few other things and needed one more item to trigger 20% off all of it and the Platinum was on a Fire sale for only $5, regular $13 or something. Anyway, I got the one that cross-referenced from the FL-400S and at the time I thought, "Hmmm, this looks kind of big..." but then I got around to doing my oil change this weekend and holy crap! This thing is LONG! easily a full inch longer than the FL-400S, it's sticks out so much you can see it just looking straight down the front of the engine bay, it's only an inch or so from the radiator fan shroud. It seemed to take a good few more ounces of oil too over the FL400S and holy crap, oil temps are ridiculously good! In nearly 100 degree heat yesterday I couldn't get my oil temps above 215 and in regular 70 degree weather, oil temps stay around 180! So, the effect is 2 fold: First it takes more oil to spread out the heat, and 2nd, it's so long that it acts like it's own heat sink/2nd little oil cooler with so much surface area exposed right behind the radiator fan. For those who want to try it, I suggest the NAPA Gold/Wix regular, part number 1516-NAPA/51516-Wix, it actually filters more finely over the Platinum and with our oil change intervals so much shorter than the Platinum filter's 15k life it's the more appropriate one to use.