The cylinder liners in the non turbo five cylinders are more subject to wear than some of the other 123 diesel engines. Do not pay attention to the 5,000 mile oil change interval recommendation. Change it about every 3,000 miles and use an oil especially formulated for diesels. There are several available including Shell Rotella T, Chevron Delo, Mobil Delvac and Mobil Delvac One. These oils contain additives that help deal with soot dispersal, a need specific to diesel engines. There are many that are TESTED and RATED for diesels, but the ones above are ESPECIALLY for diesels.