Does anyone have any knowledge of Saturn's 2.2L Ecotec engine relating to the oil filter. It has a replaceable cartridge. I always hear of oil filters that have no anti-drain back valves and how its best to avoid them (FRAM). When the engine is shut off, all of the oil is drained from this compartment where the cartridge is kept. There is a cap you remove on top of the compartment that reveals the filter cartridge. If anti-drain back valves are beneficial, why would Saturn engineer such an oil filtration system? I would think synthetic oils are critical for this engine to ensure quick lubrication on start-up. Any thoughts?