The TDI guys swear by the Pella.
I think the effectiveness depends on the design; some engines will work better than others.
I fI was going to spend $65 + shipping then I'd just splurge for a bypass filter and quit Changing oil. <- Guess what's on my TDI :-)
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2012 Tesla Model S P85
2013 Nissan LEAF SV totaled by now deceased intoxacated driver.
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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