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You must not be reading my posts, because I've said that twice now... :LOL: You're pretty well hosed in CA. I think they consider anything over 16K or has more than 2 axles to be considered commercial. Even a deuce falls under their commercial vehicle laws.

That's SC. Other states have other laws. Some states allow you to drive virtually anything if it's not in commerce, other states require add'l licensure, such as a non-CDL class A or B.

.12 micron wouldn't be caught by a .5 micron filter, in this case (obviously). The question is, if factory filters are usually 10-20 micron, what contaminants are they letting in that wouldn't do damage, that these .12 micron contaminants would. For reference, the thickness of a human hair is...

South Carolina has a Class F non-commercial license... https://www.scdmvonline.com/Driver-Services/Drivers-License/Non-Commercial-License---Classes-E-F

'Filtration won't remove them' is what I was keying on. If someone is filtering down to .05 microns, and polishing fuel, then it should catch 2 micron particles. There are nominal and absolute ratings, and that needs to be taken into account when purchasing filters.

A 0.5 micron filter won't remove 2 micron particulates? Gotta explain that one. That's like saying a 1ft wide hole can accept a 4ft wide piece of wood.

I'll try to make this brief. The multifuel engine is designed to run on various fuels as a design feature. This is why it needs stuff like the FDC (fuel density compensator) to run those multiple fuels. It also has relatively loose tolerances to accommodate the differences.. The NHC250 is...

Ease of acquiring parts. I had an M934. It was as simple as pulling up the TM, and calling Cummins with the part numbers and picking them up an hour later. The army and other branches went pretty hardcord on the COTS parts bandwagon (Commercial Off The Shelf) in the 80s and 90s, and tried to...

M939 5 ton has power steering, full air brakes, and a larger cab, and is easier to work on, IMO. However, it doesn't have a multifuel engine, but can run WMO if filtered properly and can run on some (but not much) gas mixed with WMO/Diesel.