I recently purchased a 2001 Saab 9-3 with approximately 110K miles. The car has complete service records, including oil changes, but I was considering an Auto-Rx treatment just to clean out any gunk in the engine. My concern, however, is that this will loosen some big piece of stuff that is going to clog the screen on the oil pump and then I am going to have real problems. Is this something that I should be worried about? If not, why?