Which would clean better and hold up better to a 7500mile OCI
In what machine? Moot point anyway - there exist no statistically relevant data available (to us) from which we could pick a winner. The oil companies prob have varnish/sludge buildup and clean out in gram weight for test engines and they are NOT sharing because we pick products in the dark - and they want to KEEP it that way.
RE cut open filter of M1 5w-20:
At least its in the filter. You claiming clean up or breakdown?
My subsequent run with TDT 5w40 yielded more junk in the media.
Note that this is a Fleetguard StrataPore filter, so the media is dense synthetic glass fibre, so the junk is actually IN the media, its pretty neat.