truck won't start and dealership said the oil is sludge i change oil every 4500 miles faithfully
2 Answers
All depends on the oil brand you use, also the breathing system for the crank case may have needed attention for a while. They claim oil can go as far as 8000 miles, but best results is to change oil every 3000 miles.
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For city driving it's usually best to change the oil every 3000 miles.