I previously used a two stage filtration system...a fender-mounted standard canister type filter that fed into an Oberg pancake style filter, for which various "size" screens are available.
I typically use
synthetic oil and a high-efficiency filter...the high-efficiency filter might be the reason the Oberg screen was always so clean.
My replica does not have enough clearance to be able to remove a standard size Fram PH 8 (isn't that the standard Fram full-size filter model?), so I use a PH 43 (I think--I am currently 860 miles from my replica, so no way to just check)...it is a shorter version of the PH 8 and is quite easy to remove.
Cheers!!
Dugly