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"Mobil 1M1-301Like the Champ filter, this filter is made by Champion Labs. However, it uses a unique end plate and a thicker can that make it the strongest filter available for wide distribution retail sale. It also uses a synthetic media, which inproves filtration and flow. I'm happy to say that this filter is NOT a fake. It is definitely a unique design.
It uses a synthetic fiber element that can filter out very small particles and is very strong. It is rated just under the Purolator Pure One as far as filtering capability, but is still very much above conventional paper filters. It also has a very strong construction to withstand high pressure spikes during start-up. However, as with all Mobil 1 products, expect to pay 2 - 3 times as much for this filter.
I have received many reports of these filters failing at high pressures. It seems that the seam where the backplate crimps to the case can split."
From the North Texas Acura filter study
"Comments:The Mobil 1 appears to be of excellent quality. The Bosch, Mobil 1, and STP appear to all use identical materials and construction, with only the Mobil 1 having a different filter media (appears to be coated- darker color). I can't comment on the effectiveness or any additional filtering or benefit to the Mobil 1 filter, though Mobil 1 claims it's more effective. The pleat seperation/uniformity appears better than the or Bosch filter. The Bosch, Mobil 1, and STP bypass valve utilizes a stiffer spring than any of the others and a rubber seat/seal which should help prevent leakage. Check out the last pic for a shot of a used Mobil 1- this is a 1 month old filter with 1000 hard miles and conventional (non synthetic) oil. Let this be a reminder to you to change your filter regularly!"
I went so far as to cut open each(WM and ST).Needless to say,I'm using a $1.78 Walmart(with fiberglass in media).Since the filter is only $1.78,I'll need a new engine even sooner than the $3.00 filter users(bottgers wisdom).
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