They also concluded that no oil brand or type consistently produced more or less sludge or varnish than any other. Their result that the range of wear levels across all 75 brands and types from what could be called the best to what could be called the worst was thinner than a thin, glossy magazine page. After 100,000km/60,000 miles the taxis were pulled off of the road and the engines were taken apart to test the wear levels on vital engine parts.
The cabs were driven day and night in stop and go traffic with the oil changed every 10,000km (6,000 miles) instead of the recommended 5,000km/3,000 miles in order to get worst-case scenario results. They put these oils into the toughest street-legal test imaginable for oils, New York City Taxicabs. Consumer Reports once did a test of 75 different brands of oil, this test included synthetics, semi-synthetics, virgin conventional and re-refined conventional. Either the vast majority of mechanics are automotive morons or they just respond differently to the different marketing strategies of the oil companies. There are mechanics who swear by Pennzoil, mechanics who swear by Valvoline, mechanics who swear by Quaker State, Castrol, Havoline, Mobil, etc. The other side of this racket is the oil itself. If they ever did a test like that and published it, nobody would ever buy first-line filters again. This is why you NEVER see comparisons of Fram vs. It wouldn't make good business sense to stop production because it would cost the company more money to make a product with a narrower profit margin. If you were making two lines of filters, would you go through the time and expense of stopping the line and retooling just to make an inferior product or would you just do one production run, paint and market them differently and save the time and money? I think we know the answer. Think about this from a corporate perspective. The only difference between the two is paint, marketing and the "easy-grip" is not found on the Defense, Pennzoil or Canadian Tire filters. In the case of FRAM, the Defense filters are listed as a second line at a lower cost but have the exact same warranty as the RAM filters.
The silicone-rubber valve is made orange in colour to look pretty and make you think you're actually paying for something when in reality, you're paying for overkill. In everyday use with oil changes done at intervals of less than 10,000km, both valves function perfectly. In the case of WIX/NAPA Gold, the silicone-rubber anti-drainback valve is superior to the nitrile rubber valve on the Kralinator/NAPA ProSelect/Silver, but the OEM requirement is only for a nitrile rubber valve. Oil filters must meet or exceed OEM requirements of the vehicles for which the manufacturer recommends. Think of this from the company's perspective. With regard to specialty filters like Fram Racing, Purolator PureOne, etc., there is a difference. As someone who has worked for 6 years at NAPA as well as independent auto parts stores and have had long, candid conversations with petrochemists and sales representatives from Honeywell (FRAM/Defense/Canadian Tire/Pennzoil), Dana (WIX/NAPA/Kralinator/Delco) and ArvinMeritor (Arvin/Purolator/G.A.P.,), I can tell you that there is NO difference whatsoever as far as the internals of OEM-replacement filters.
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