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Message: <blockquote data-quote="awyeah" data-source="post: 434026" data-attributes="member: 19607">Hi bro,The 318 is a 4-cylinder, 325 is 6-cylinder. 2.5L More engine power, more fuel consumption. 318 is a little under powered, since the car is heavier, 318 manual is still better compared to auto, however. 325 also has vanos. I believe the engine parts will be similar cost (or little higher) for 325 as compared to 318. The 325 can have additional sensors, such as ASC, depending upon the year/model.The parts to check when you buy a car will be the front and back shocks, steering rack, radiator.Most of the problems in bmws are either the sensors, cooling system (radiator, water pump, compressor etc), electrical wiring alternator, etc. Also check for any oil leaks throughout the car, if there is a leak, then that has to be fixed.Take the car to a reliable mechanic before you buy it. Initially, you will have to spend some money on repairs, when you get the car (unless it is in perfect condition). After that your maintenance cost should be lower.After you buy the car, you can do a full inspection (including the computer one), which can tell you what sensors are working, what are faulty.</blockquote>