Helterskelter wrote:
A friend of mine with a turbo S2000 told me that the S2000 community prefers FRAM filters because they are higher flowing than other filters. When a motor spins to 9000+, I guess flow is a serious issue.
So filters are a compromise between flow and filtration. I'm sure they all work fine if changed on a regular basis. I personally lean towards maximum filtration.
This conclusion is bass-ackwards; let me explain, the frams have less filter media than all the other leading brands, or so I have read many times, less filter media means that it will have less flow, and the flow rate will deteriorate more quickly as the filter media becomes clogged. The two factors that will have the most effect on a filters flow rate, aside from the oil it-self, are the porosity of the filter media, and the total surface area of the filter media.
Assuming the filtration micron ratings of the leading filters are similar, If brand F filter has a cartridge that is 2" tall and has a pleat depth of 3/4" and 100 pleats it has a filter surface area of 300 square inches. If brand W filter also has a 2" tall cartridge with 3/4" depth pleats but has 150 total pleats it has 450 square inches of surface area, a significant difference to say the least.
If you have something that causes your filter to clog, the filter with the most surface area will continue to work properly with less oil pressure loss for a longer period of time, conversely the filter with less surface area will become completely clogged in less time and its internal by-pass valve to open, allowing full oil pressurebut with no filtration, and possibly washing out trapped particles back into your engines oil passages.
In fairness I will admit that I have used fram fitters on low performance engines more than once, but they aren't my first or even second choice. Also the only filters that I have ever seen fail completely of their own accord were frams (twice, both on industrial engines). I do think that the grippy surface on the canister is a great invention, but not great enough to get me to use them on any HP or severe duty engine.
just my $.02