Originally posted by cbass
The sludge will get in there and clog your oil pump, screwing it up. The clicking usually happens from sludge getting lodged in a oil pipe towards the top of the engine. Then the pump has to work harder, and it gets clogged up and you get clicking. I replaced my oil pump and haven't had problems since. Just as I did before I had the pump replaced, I continue to use synthetic and change it every 5000 miles.
How much was it to replace the oil pump?