Filter WHAT

Maybe some of our California contingent can shed a little light on what we're looking at here.

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Oh ya Joe that takes sewage waste and recycles it back to pure drinking water. Am I close?

Does it have engine oil lines connected to it? If so maybe a bypass system to extend oil life.

I think you nailed it Billy a bypass filter system. They are suppose to really extend drain intervals with proper oil analysis.

I have a friend that runs them on his big truck and uses Amsoil and sends his oil off to be checked every 5,000 miles. He says he usually only drains every 75,000 to 100,000 miles. (His words not mine)

I don't think so, both of u, did you see the tag on it it looks like some type of a air clean requirement.

It looks like an oil spinner but bigger than the ones I'm used to seeing. It's a little bigger than a rugby football kind of big. I don't see how the California bureaucrats would be requiring something like that for air quality thingy. If you think I know what it is and I'm trying to pull teeth here I don't have a clue what this is. later on today I suppose I'll do a web search if nobody knows but I've never seen one of these on a bus before.

It says California Executive Order d350 Air Resource Board on the bottom of that label.
Possibly cleaner engine oil creates cleaner crankcase ventilation but that's a complete guess.

Crankcase ventilation filter?

Puradyn

Bypass oil filter

I wonder what the California regulations tag is doing on there I'm pretty sure this bus never resided in California okay so it's an oil spinner thank you.