At the recommendation of a trusted indy, I removed my Carrera's factory filter cap and inspected the bypass valve.
It was completely loose in the housing - allowing unfiltered oil to circulate. For how long? Who knows - I never noticed it or even knew to look.
I replaced it with LN Engineering's oil filter adapter and an M1-206 filter, allowing full-flow filtration. A nicely machined piece, and it allows me to use a filter with a higher efficiency rating than factory - and NO bypass valve!
It was completely loose in the housing - allowing unfiltered oil to circulate. For how long? Who knows - I never noticed it or even knew to look.
I replaced it with LN Engineering's oil filter adapter and an M1-206 filter, allowing full-flow filtration. A nicely machined piece, and it allows me to use a filter with a higher efficiency rating than factory - and NO bypass valve!