hey guys. i did my oil change and in the bottom of the oil container i found some solid black grit". I also found a few in the oil filter.
to the naked eye, it just looks like regular carbon but unlike carbon, it does not smudge or fall apart. There are only a few of them.
my car is a 06 9-3 with 190k miles. engine runs smooth, no engine or oil lights. engine does not knock. regular oil change ever 3000-4000 miles with mobile one. no metal shavings in the oil filter.
what would it be? plastic? carbon?