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oil tends to turn black if the oil hasn't been changed in over 6000 miles. or you have lots of soft carbons built up in the motor
how to resolve
1. change your oil at 3000 miles unless its synthetic (6000 miles)
2. get a motor vac. its like 80$ it removes all the gunk outa of the injectors. run marvel mystery oil or lucas to prevent soft carbon build up
sources : personal experence my dad is a ASE master Tech
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