2016 Mazda CX-5 GT AWD w/Tech Pkg
- Plano, Texas, USA
Plenty of good information here. But I have to say that this may not be true if the filtering media which filters less efficiently will have higher flow rate. The filtering media in Mazda OEM oil filter has much larger total area when people cut it open and check. Larger media area with higher efficiency 15-micron media still can achieve higher flow. That's why OEM oil filter is the best for our SkyActiv-G engines, not to mention other specs on OEM oil filter which are also different from traditional oil filters.Thank you yrwei52 for the PDF. The only thing it specifies from a technical standpoint is that it's a "high flow" filter. This amount of flow (whatever that is) can be achieved via two mechanisms; filtering media or bypass valve. Filtering media is relatively self explanatory, a media which filters less efficiently will have higher flow. A filter with higher efficiency will have a lower flow rate. Mind you, lower flow rate doesn't mean that the engine is being starved for oil as it's ultimately the oil pump which is responsible for the GPM rate. An engine being starved of oil due to the filter is an extremely rare occurrence. However, in an event where there is an unusually high amount of oil pressure, the bypass springs open so that the oil literally bypasses the media and flows through the filter unfiltered. Even in these instances, a complete opening of the bypass valve is unlikely. It should be noted that efficiency isn't the only thing which will cause this increase of pressure. Oil viscosity, temperature (cold temps will increase the viscosity of the oil) and high RPM situations will increase oil pressure.
I've cross-referenced several filters below. You'll see there's quite a bit of overlap between the bypass pressure that's "required" of the OEM filter and aftermarket filters. Given that, I'd rather go with a filter that is more efficient. Though it should be noted, while the efficiency of an oil filter is important it's not the most important aspect of a vehicle's filtration. That would go to your engine's air filter. I'll put the Wix "custom" filter and the Wix equivalent to the B6Y1-14-302A at the top for direct comparison.
Wix 57002 - PSI 11-14 - Nominal Micron Rating of 15
Wix 51365 - PSI 8-11 - Nominal Micron Rating of 21
Purolator L14612 - PSI 14-18 - 96.5% @ 20 microns
Fram XG6607 - PSI 13 - 99% >20 microns
Bosch ST3300 - PSI 8 - Micron Rating of 20 (assuming nominal)
MicroGard MGL57002 - PSI 11-14 - 95% @ 29 microns (MicroGard is made by Wix)