Motorcycle oil filters exposed!
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Mobil 1 M1-110

Evaluation date
July 2003

This filter was donated to the cause by Arved Grass. Thanks!

This is a well-constructed filter, which Mobil 1 touts as having 98% single-pass particle filtration at 10 to 20 microns, and multiple-pass efficiency of 95% (vs. 80% for the average filter). I cannot verify these figures, but Mobil 1 at least gives them to you.

In terms of construction, the filter has some notable features, such as a rubber-sealed bypass valve. The only slight concern I have is the significant amount of adhesive holding it together. The shadow at the lower right of the filter is not a shadow at all; it is black adhesive. Adhesive was also found smeared on top of the endcaps. The adhesive had not run as far down the filter as the Dennis Kirk unit, therefore I would contend that these are merely blemishes and quality control is still worthy of recommendation.