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I have a 2007 C2S manual with about 132K on the odometer. A low oil pressure light has started to show up at idle after the car is warmed up. It seems as if the light is gradually coming on more frequently. The pressure gage on the dash reads around 0.5 bar when the light comes on. When the car is cold the starting pressure is around five bar and is about 3 bar at 3000rpm. As it warms up the pressure drops to about 2 bar at 3000rpm. I always run 0-40W Mobil 1 and change the oil every 5K miles. With the engine off and turning the key one click the pressure gage rises to about 0.1-0.2 bar