I'm pleased with Microgreen results. I wasn't sure if their integrated bypass system worked or a scam but I liked the idea so I tested particle counts comparing Microgreen with a K&N using identical oil and driving routine. Microgreen did extremely well. My latest run was over 15k miles. If I continue at 15k intervals, cost isn't bad.
Micron particle size and respective counts/ml. Note, first count value represent oem size microgreen filter, second is oem size K&N and third is an oversized mircogreen filters. First and second count had ~12,000miles, whereas, third is with 15,458miles. First two counts is with RedLine 5w20 and third with oversize filter with 0w20 Redline. Car is a 2009 Focus.
>=2: 1085,, 2878,, 833
>=5: 402,, 1066,, 308
>=10: 111,, 295,, 85
>=15: 43,, 114,, 33
>=25: 10,, 27,, 7
>=50: 1,, 2,, 0
>=100: 0,, 0,, 0
Doug