They have two elements to filter out the gelling that I quite common in Toyota's, if oil never gets up to operating temperature, after a while just turns to sludge, the properties in oil help to fight moisture but over the interval will break down just like the hydraulic fluid in your break system, it will eventually start to work against you, leading to oxidation in the top end at first than work it's way down ;-) American vehicle's I've never heard of the oil gelling in them, that's why we use good oil in a little less filter, American cars will burn the oil before it gets a chance to gel, I believe from and engineering standpoint, we as Americans just build it better, there is no perfect car but look at Craig's list, how many Toyota's are up for sale with mechanical engine defects vs, let's say a Ford or Chevy, car for car pound for pound, we just build it better no need for a $17 oil filter unless it's a K&N, and your hot rodding it out, just my thoughts
