Hyundai Genesis Forum - View Single Post - Engine oil overfilled - Makes knocking sound
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post #2 of Old 08-02-2017
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Overfilling the crankcase with less than half a litre, which is approx. 17 ounces will not cause damage to the bearings, to cause a knock. Bearing failure is caused by wear, not doing oil changes often enough and using the wrong oil. What is your mileage? What kind of oil do you use? Why on earth would you take it to a quick lube place, they use crap. You should have been using 5W30 or 5W40 full synthetic oil from day one, not the 5W20 the owners manual says. There was a TSB about using 5W30 or 5W40 (depending on temperature/climate), colder climates use 5W30, hotter climates use 5W40. Most likely you had sludge in the bearings and it loosened up with the new oil's detergents.

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