No. Oil turns black because of heat cycles and soot. The soot is usually too small for even the finest oil filter to catch.
I would have agreed years ago with statement above, but after using a pair of FilterMags and added magnets on my spin-on oil filters
and the UOA reports, it turns out the oil in a late model car with a good engine turns black due to wear metals
in the oil!
Possible exception is soot production in a diesel engine or very old vintage engines with tons of blow-by!
As to filters, I've tried every kind of spin-on filter out there, always the same, black oil in 1 month or so.
Another way to keep the oil cleaner is to do a Kerosene engine flush at the next oil change and the new oil
will look cleaner about a month longer then usual, then it turns black again. Because Kerosene and any other
commercial engine oil flushes is an astringent, you can't use it all the time, or the seals will dry out, shrink and leak.
Currently I can keep the oil amber colored/ clean for 6 months 6,000 miles with 2 FilterMags,
6 small bar magnets on the outside, 2 bar mags down the center tube, 4 small mags around the oil threads
and a big ring mag on the end! Yeah, looks a little much and I don't know if I can stuff more on it,
but I'm getting a UOA in the spring when I get to 8,226 miles and see how it compares to my last result with
6 less magnets!
Really small wear metal particles have less attractive force to the magnets as the oil flows compared to big particles
so to get the most metal out of the oil you need a lot of magnets. I started with just 1 FilterMag and upped it
a step at a time and the UOA results improve each time. Iron wear tracks with mileage for sure, almost linear
if you drive the same way. Other metals like lead and aluminum drop a bit too since there's less free iron
circulating to cause 'secondary wear'. I wish I thought of doing this in my 20's!
Check out the pics in this:FILTERMAG vs HOMEBREWhttps://app.box.com/s/uxvu8dmscf5wcgftutdm0ejqwgn86tw7