Engine oil sludge can build up inside the engine blocking the oil from reaching all the way inside the oil passages resulting in engine failure. The oil sludge is difficult to diagnose because a blockage does not affect the oil level. The lack of maintenance causes the oil to break down and oxidizes due to the intense heat of the internal combustion inside the engine, creating oil sludge. This sludge reduces engine lubrication, which causes increased friction and damage to the engine. Fortunately, by removing the oil pan from the engine you can remove engine oil sludge. Regular oil changes can help your engine stay well lubricated and free of oil sludge.