Posted by Brian Jasper co. Ia on December 03, 2008 at 10:50:35 from (65.121.139.196):
In Reply to: Oil filters revisited posted by Brian Jasper co. Ia on December 02, 2008 at 17:21:26:
All engine oil filters have the element spring loaded so if it clogs or in the event of extreme cold thick oil, the filter doesn't starve the engine for oil. Hydraulic filters are different. They have no bypass in them. They also have a much finer filtering capability. If I remember correctly, an engine oil filter has about a 15 micron rating where a hydraulic filter will be something like 5 microns. Amsoil used to sell an add on bypass filter maybe they still do, that would filter out the dirt, combustion contaminates, water, etc that causes engine oil to turn black. Surely they do it by having a much smaller micron rating. We change oil because it's dirty, not because it's worn out. I've seen a few responses on "efficiency". Simply put to allow more flow, there must be MORE surface area, or LARGER pores in the media allowing for larger impurities to not be removed from the oil. Thats how K&N filters flow more air. They don't tell you they also let more dirt through. Like one guy said, he puts the coffee can size filter on in place of a muffin sized filter. Not a bad idea. Under normal conditions where maintenence is kept up I doubt there would be an issue with the "muffin" filter. In extreme cold, or neglected maintenence that could be the difference between the filter being bypassed and allowing unfiltered oil through. My thoughts are I want the best for my engine. If I know one brand of filter is not as good as another, I'm going to use the better one since I'm not one to trade vehicles every couple years. I recently sold my old 88 Bronco 2 to a co worker who just wanted transportation. It has probably 500K miles on it. I know for sure the engine I put in has almost 300K and is still running strong with no oil leaks/use. I attribute it to regular oil and filter with a Motorcraft filter and Castrol oil.
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