According to this website, the Amsoil, Hastings and Baldwin filters are similiar in construction and probably made by the same folks if truth were to be known.
http://minimopar.knizefamily.net/oil...study.html#sae
This fellow says he is using Baldwin and he spent all this time and money cutting up filters, speaks volumes to me! Baldwins seem to be exceptional considering their low cost.
An increase in pressure from a filter would indicate an increase in restriction, considering that oil is non-compressable like any other fluid, the volume of the filter will not increase or decrease pressure in and of itself. Proper pressure is important, but so is flow. My point is that the 164 needs to filter 2 gals (!) of oil, way more than a tiny Fiat. I'll take the larger filter please. Just stay away from a FRAM, QUAKER STATE OR PENNZOIL, all made by FRAM. This is one of those companies seemingly only concerned with BIG volume to the big box stores and the chain auto parts stores not the quality of their filters.
Charles
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'91 164L 5 speed 180k and counting
Chattanooga, TN - Home of the new VDUB factory!