Driving down the two-lane today, feeling good because my '86 325e seems to be running better since I loaded up on injector cleaner. Mellow. Suddenly, an unknown BEEEP happened, and I thought, S***. What's happening? 4 more BEEPS before I tracked it down. The car is full of surprises: it was my radio. It told me the tape player needed cleaning! Waiting for the next shoe to drop.