Not many people check their oil filters. They only buy by name. Good. But if you're a techie, just know that cheap filters (like the cheapest Fram) are 40 microns, OEM quality oil filters are 30 microns, WIX filters are 20 microns, and K&N are 10 microns. And also. The gap between the rings and the cylinder wall is 19 microns and between the necks is 9 microns. The more you can filter out, the less likely horn particles are to get caught between moving parts and cause wear. According to EPA research, a V-8 engine with a 40 micron filter lasts about 100,000 miles. The same motor goes up to 200k at 30um, 300k or so at 20k and 500k+ at 10um. Of course, there's no point in buying these K&Ns because nobody keeps their car that long (unless you're a cross-country carrier). But for us boys who love our cars, there's never too much! Finally, because I love talking about oil, instead of buying expensive synthetic oil for your car, consider a "bypass" oil filter. AmsOil, EcoMicroFilters and others sell them for around $500, and a replacement filter for 15,000 miles is around $12. All bypass filters filter down to 2 microns. (For reference, bottle freshness is 3-4 microns!) The fact is that with an by-pass filter your engine will never wear out and you can use regular oil (synthetics only have advantages in extreme temperature ranges like Yukon winters and racing machines where the oil temperature can reach 400 degrees exceed Fahrenheit). And to really make you cringe when all the contaminants are cleaned out of your engine, you can safely drive 20,000 to 50,000+ miles between oil changes. Serious. do an oil analysis first and see. Even at 40,000 on my regular Valvoline oil for my tundra, it's cleaner than fresh out of the bottle. When I run an engine analysis, it shows that it is "new oil" (e.g. none of the additives have been used up at all). The good thing about a bypass is that once you make the investment, it lasts forever because you simply transfer it to your next machine. You don't have to buy a new one every time you get a new car. Even if your engine runs forever, you're really only doing the guy who's going to buy your car a favor. But we don't spoil our trip just because it makes sense. Anyway, sorry for the wordy review of this K&N filter. But I think everyone who buys K&N likes to talk about business. :)
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