Quote:
GM has a number of engines that use a vertical-hung filter. No ADBV needed and the bypass is in the engine. That's why I avoid filters with a spring inside, like Wix filters come with, Don't need any spring or ADBV.
Seen similar comment twice recently now, so 'IMO' clarification is needed.
First, Wix uses no thread end or dome end bypass (spring) in applications for 'older GM' and others that have block bypass. So there's no "spring inside" to avoid on those applications. The only spring used is the compression spring which in Wix's case happens to be a coil spring, as opposed to the leaf/flat spring used by Fram and others. Compression springs are required and used on all applications.
Second, yes 'Fram' chooses to use no adbv in this application. Been discussed here before. However, many other manufacturers of filters for this same application choose to use an adbv. Using an adbv even where not specifically required hurts nothing. Not true of vice versa. The FU shown is but one example, Wix/Napa Gold another. And iirc, the ACDelco OEM replacement filter(s) for older GM all spec/use an adbv. This is true, even as some of the GM factory filters use none.