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Never worried about it, it's just a side effect...besides, low MPGs and low air pollution are not mutually exclusive. The multifuel engine happens to be very efficient, read about the "hypercycle" and find out. Recovering the oil from the breather fumes and returning it to the crankcase also...

No problem Eric, theoretically, since there is some positive crankcase pressure and the tube originates on top of the engine, the engine must be submerged for water to enter. The TM's are generally not good at explaining the "why", the only state what must be done and how to use the equipment...

Depends on what "As it is now" refers to, the crankcase will take in water if the breather tube is not modified from stock when the water reaches the air intake. If the "What's wrong with it in stock form" question is directed to me (you asked twice), there are two reasons, one to simplify the...

There is a PS mag note on this mod, no biggie, just keeps the starter clean...

If you measure the pressure in the crankcase, you'll find it's slightly positive. There is no under pressure and the original "road draft" tube just helps in getting rid of the oil laden fumes. The filter in my application does not create a restriction. It is a common solution to engine...

Yes, it was done to simplify preparations for fording, swimming in particular. The m656 series with the LDS465-2 engine has an engine compartment that can be completely submerged with a 5-minute "pressurization of components" wait only. I added a crankcase breather filter (Crankvent) to speed...