My local indy autoshop still uses WMO to heat it's shop. They are not a sketchy operation either.

If you looked at filtered WMO through an inspection microscope, you'd be horrified. Then see how many of those particles are metallic.

Maybe it really doesnt matter, but, I really wouldn't run them through my IP. And I say this as a WVO/homebrew bio user.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car