When I first used the FL 16035 back in 2006 I was told it was a 20 micron, recently noticed it being listed by sellers as 30 micron, so wonder if this true or not as I prefer to not run a 30 micron oil filter and sticky use the 15 micron Donaldson DBL oil filters, I only used the LF 16035 as my order for Donaldson arrived late and thought it was still 20 micron so no harm no foul, I only found out about the Fleetguard being 30 micron after my oil change....