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Solved my issue. It was the same flapper/anti-return valve issue: https://www.audizine.com/forum/showthread.php/949208-P164D-Low-Oil-Pressure-Gas-in-Oil

2012 B8 S4 with 118,000 miles. I am having a similar issue. I did a good bit of maintenance work which included replacing the oil filter housing/adapter due to a leak. I installed a Vaico unit that I bought from FCP Euro. A few hundred miles after doing the maintenance I started getting the low...