Ahhhh....I get what you're saying now. You were more looking for war stories. First and foremost, I disagree with your premise; there is no such thing as too many Tecates.Your concern for my engine longevity is noted, but what I'm asking is why has that been made rule numero uno for the trips? Has someone with an oiled filter lost an engine on the trip, has someone stopped the group while they cleared an oiled filter so the engine would run, did a guy get held up at a Federale checkpoint while they ran the CARB number, or do they cause the wasting of too much time on a beach while people debate the merits of open element or factory filters over too many Tecates? Your reasons sound like good advice for someone looking to know if it's a good or bad idea to purchase, but I was curious to know if it had any past impacts to trip success.
Seriously though, I haven't been on a run that an air filter was the cause of a delay. An air filter isn't the type of thing that would hold up the group. Most people run with 2 or 3, so if you did have an oiled one that needed replaced, someone would just give you a paper one and we'd be on our way. I'm also curious to hear any war stories.
The closest I have is the first "Ultimate Expedition" with EXO. It was so incredibly muddy; a woman at a gas station asked me what color my truck was because her friend and her disagreed and couldn't tell. I definitely had mud in the air filter and everywhere else. Anyone with an oiled filter sure would have had to clean it once we got to the hotel, but it is hard to imagine a scenario that it would bring the run to a complete stop.