Hi,
I have a 2001 Buick Century with about 40,000 miles (60,000 km) on it and change my oil every 4,000 to 4,500 miles with Mobil 1 5W30 oil. I have heard and read about these additives that one can add to their oil and it cleans the engine out. I was wondering if someone has tried this and if it makes any difference. My concern is that if any crap gets loose with these detergents, it could possibly block parts of the engine and restrict oil flow in those areas and cause more harm then good. Is that possible or am I wrong.