Recently bought 2002 w/the 5.4L engine. Only 50000 miles. Main reason I bought it. Previous owner said he had local garage change oil every 10000 miles. Seems a big/long interval to me. Had oil changed when bought it. Shop used "bulk oil" (their paperwork term) and a std NAPA filter. Now have been reading threads that speak some about oil to use, the type of oil filter (anti drain back valve) and of the timing chain oiling issue, which I seem to have off and on. When does occur, rattles for 5-10 secs shortly after start up then all is good. So, any comments or suggestions? Should I go have "better" oil used and the better filter? Would such a "short interval" change do anything for the timing chain issue? We are at sea level, plan to use car to putter around, use its volume to haul some relatively light stuff. An occasional trip up to 4000ft high park. Car was a rental for first couple years, so most mileage was done early on in its life.