Originally Posted By: ZeeOSix
Originally Posted By: DuckRyder
But to answer your question, based on the Amsoil OEM filter test and PUROS specs for the boss, the boss very likely filters more efficiently.
Per the "Purolator Response Office", the Boss is 99% @ 40 microns (not 20u), so not very efficient -
LINK .
Interesting I wonder if that is for all filter part numbers as I seem to recall that certain part numbers were rated at 40 even back in the yellow can days. The amsoil test rates an 820S at 93.7% @20 so not the same part number we are talking about here.
So is 99%@40 better or worse than 93.7%@20 and is the efficiency of an FL500S the same as an FL820S and has said efficiency remained unchanged since 2/2011 and additionally was the FL820S tested by Amsoil representative of all FL820S? Lotta questions there.
Side note, I think omitting the micron ratings (particularly when they are different) on the website is shady.
Originally Posted By: dlundblad
The boss is wire backed synthetic.
It is a plastic mesh. (Puro calls it “Polymer Mesh”)