How do these filters compare? I have always used M1 filters and been pleased with the results. However, it would be nice to get the filter at Walmart when I get the oil instead of stopping on the way home at the autoparts store to buy the filter. From what I have found so far they same to compare rather well. I even found a UOA with some very impressive particle counts for D+. I take that with a grain of salt for all the reasons discussed when comparing filters using particle counts but its still nice to see good numbers. Bosch and Mobil seem to use different tests regarding efficiency according to their websites... Do they? I'm willing to accept that I just don't know enough. The Bosch rates higher but again, they appear to be measured by different standards. Anyways, does anyone have experiance with both? Favor one over the other?