The 2003 BMW 325 lineup came in four trim levels: i, xi, Ci and iT. The 325i was the base level and it came as a sedan with BMW's 2.5-liter, in-line six-cylinder, which produced 184 horsepower and 175 foot-pounds of torque. The cooling system in this engine requires a specific amount and type of coolant to maintain its correct pressure and to lubricate the water pump.
The 2003 BMW 325i has a total coolant capacity of 8.9 quarts, or 2.2 gallons. BMW recommends a 50-50 mix of ethylene-glycol-based antifreeze and distilled water.
