Any oil forum eg BITOG or NORIA has hundreds of UOA's where it's easy to spot who's using a Krap & Nasty, in fact they are the standing joke on oil forums and most international BMW forums as the only brand of 'filter', you can pick from UOA results. Particularly sad when you can buy filters that filter 100 times beter, better airflow, better built, no oil to screw the MAF, and don't look like they were built by your grandma in her kitchen, oh and cheaper and U.S built. The classic case of superb marketing over performance.