Quote:
Originally Posted by funola
Does anyone know what the micron ratings are for the 2 filter sections?
1. Main
2. bypass
It sounds like they are physically separated and requires a seal (25) on the clean side so they get routed to the proper ports b (engine bearings) and c (oil pan).
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There is 2 big long Oil Filter Threads (in the DIY section) that talk about them nearly to death.
Rather oddly the Filter Companies only can tell you what Micron level the Paper Element part of the Filter is.
The companies that make Filters that use "Cotton Jin" in the Upper/Larger/Finer part of the Filter seem to have no idea how well it works.
List of the Microns of some filters (617.952 types)
http://www.peachparts.com/shopforum/showthread.php?t=247597&highlight=Bosch+Oil+filters&page=3