The 3.8L V-6 has a sporadic reputation for burning oil. Pull the dipstick and check the oil level. If it’s low, listen intently for knocking or clatter upon initial cold startup. This isn’t a fool-proof test, though, since the horizontally mounted oil filter requires a good anti-drainback valve. Engines equipped with cheaper aftermarket filters lacking the anti-drainback valve can experience the clatter on startup. Oil consumption stems from carbon buildup on the valves and rings. Allowing the engine to ingest a top end cleaner through the brake booster vacuum hose can free the valves and rings of carbon deposits and minimize oil usage.