I like the OEM look of the front spoiler, etc. Mine has 200,000 miles but everything has been replaced except the engine, trans, and differential. I would recommend - along with a lot of others here - pulling the lower oil pan. It's a half hour job and a gasket. You can see if there's debris from timing chain rails, etc. Be sure to clean and oil or anti-sieze the bolts before putting them back in. A 1991 318is is (insert word meaning the best).