Does the fluid lose it's lubricity over time? There is nothing to contaminate it like engine oil so that's not an issue. I don't believe the filter could ever get stopped up with normal wear particles, there's too much surface area. The only time I've ever seen a filter stopped up was on a 727 bought from a junkyard that had been sitting for years. It started buzzing like the pump was cavitating and we found that the pan was full of sludge which had gummed up the filter. It's been stated that B&M just wants to sell oil. So do the other oil companies. I admit I'm a flatlander so maybe it's just so much easier on transmissions here.
