My son drove his Mazda 6 for 5-8 miles after it started knocking. I checked the oil, filled it, but it's still knocking. Not as bad as before, but it's been 10 mins. I ran the engine for 2 mins to get the oil going through. What do I need to do now? Could he have a blown gasket after only 5 miles?
What makes this problem better or worse?
Adding oil made it slightly better; acceleration makes it worse
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