Look for the thread by @Hohn where he cut open a pretty loaded up filter after using Valvoline Restore and Protect.I would like to add that their is no reason to run a high capacity filter. R&P is designed and formulated to slowly remove build-up, unlike a flush. It disperses the removed molecules in the oil, depositing the larger molecules that may be captured in the filter while keeping the smaller molecules that will not harm an engine in the oil for removal upon oil change. We have yet to see a filter, to my knowledge, that has gone into bypass due to R&P.
Update - here's the thread. Of course this depends on how dirty the engine is.
Thread 'M1-110 filter after 2500 miles of Valvoline Restore and Protect' https://bobistheoilguy.com/forums/t...iles-of-valvoline-restore-and-protect.394148/
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