I canât make out what he is saying about âgalleysâ being separated by a plate, and other things. The filter base plate? Canât make any sense of that. It seems like a lot of talking to confuse. I still have no answer as to why the oil stays put under the check valve, but drains down without a check valve, almost immediately he says. I honestly donât believe that. Subaru has engineers.You are correct! I just got this reply from Kevin Baxter. I am also a little leery of blowing 3 seconds of 140 psi air into my engine to bleed the oil filter down. That is my only hesitation with this product. My compressed air usually has some moisture in it. @mphilleo your thoughts on this?
Baxter reply:
Normally anti-drain back valves work, however, the oil supply galley from the pump to the oil filter and oil supply galley from the oil filter to the engine run parallel inside the engine cover with only a steel plate cover to separate flow, no gasket is utilized. Head space air pressure trapped in the oil filter expands to atmospheric pressure when the engine is shut off. This condition forces the oil out of the oil filter through the center outflow port and empties the outflow supply galley feeding the engine. Air then passes by the steel plate separating the two galleys and allows oil to drain back between the oil filter and back to the pump. By keeping both galleys flooded, no oil flows and air does not enter when the engine is turned off.
Our patent pending check full flow check valve is a precision device and has never failed in our products or testing.
To empty the oil filter prior to filter replacement, apply 3 seconds of compressed air to the Schrader valve.
But there is a purchaser here who says he likes it, so there is that first hand real world data. I would go with Subaru, what happened when the car was new on the lot? Clattering on start?
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