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Because it's picked up lots of particles over time from internal engine wear. Even after putting clean oil in that oil will soon turn black since it mixes with any old oil and particles that did not completely drain out first time around.
You can get that gunk out of there by mixing 1 quart of oil with 3 quarts of K1 Kerosene and start the car and let it idle until it warms up. Leave the old oil filter in. Then dump the kero and old filter and put in whatever oil you use (I use 3 quarts of 10W-40, a bottle of Dura-Lube and a can of Engine Restore. The Restore seals the scratches in the cylinder walls and you will notice the different in MPG after a hundred miles, or so).
After you do the kero trick, you may want to use 4 quarts of oil, run it for a couple of hundred piles, then do the above with the Dura-Lube and Restore. You can get all this at Wal*Mart in the automotive section. MotorCraft is Ford's oil of choice. It's their brand. Purple Triton is good, too, if you can find it. Probably get that at AutoZone, or NAPA. I usually wind up using Pennzoil.
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How often should you change your oil filter?
If you intend to keep your vehicle's engine clean, change it every time you change your oil. The filter holds the dirt your engine generates. Hence the dark color of your oil as it ages and is pumped through your engine. Dirt is dirt. Get it out.
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To change the adjective "dark" to a noun, you can use "darkness".
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There is no Dark Knight 2.
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From a Birthday Card
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There was little formal education.
