Some Mann-Hummel info:
https://www.mann-hummel.com/mhuk/upload/doc/HBHCK_CtaRf.pdf

HU 951x(om606) ...HU 718/1k(om611 cdi )-99%separation efficiency at 38micron particle size.
........
And this is an older variant of the document.No mention of ISO 16 889 test yet.
http://www.mann-hummel.com.sg/EN/industrialfilters/doc/MANN%20Filters%20for%20Liquids.pdf