VTEC, hundreds of used oil analysis on bobistheoilguy.com website show that too frequent oil changes actually increases engine wear as evidenced by engine wear metals in the oil samples sent to analysis.
BLACK OIL doesn't mean it is bad in any way. The only way to know if your oil is shot is to send in a sample to a lab and they can tell you. Pulling oil out too soon, e.g. 3k oil change intervals actually is worse for your engine with an extended oil change interval oil such as Mobil 1.
BTW, my oil in my vehicles (diesels) turns pure black in about 20 miles of use after an oil change. Using Mobil 1 ESP in my wife's car, she gets 12,500 mile oil change intervals and Usinb Mobil 1 TDT in my vehicle, I go 10k on oil change intervals. Both intervals verified using blackstone labs or my oil analysis. Get a UOA (used oil analysis) VTEC and you'll see that your engine is full of silicone because I'd bet anyone you use a cold air intake with a K&N type airfilter....they are known to suck in dirt....the cost of a free flowing intake is reduced filtering.