Mp3 here:
At 145k miles, my "previously owned" '88 325 makes this sound when I first start it up. I've only owned it about 500 miles now and it's getting more noticeable the colder the weather gets. It's about 38F for this recording. It goes away after the car warms up to operating temp. It taps if it's been sitting for a few hours during the day til the temp comes up again but not this bad. It drives fine and doesn't smoke or use much oil. I had a little trouble with the recording so after the starter cranks that's me turning the sound up a bit. If anyone has any car mechanic type advice I'd be grateful. Thank you.