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You should check the level of your anti-freeze, oil, transmission fluid, power steering fluid, and brake fluid regularly. A good time to do so is when you refuel. Even if your car doesn't leak fluids at the moment, one can occur at any time and you can identify it by checking the fluid levels often. You should also check the color of some of these fluids. Some of these have see-through plastic tanks that you can look through, and some have dipsticks. Anti-freeze should be either pink, green, or yellow (Pink for newer cars with "Dex-Cool", green for old cars with plain Ethyl-Glycol, and green or yellow for cars that have been flushed and filled with universal antifreeze...brown antifreeze should always be flushed, it either has rust or a lot of dirt in it, probably both.Also, never mix different kinds of antifreeze; if you don't know what color antifreeze your car has, buy a universal brand. Oil will normally be slightly clear (when new) to brown. Oil that looks white and milkshake-like may be contaminated with antifreeze/coolant or very rarely, just a large amount of condensation. You should take your vehicle in for service soon if this is the case. Transmission fluid should be bright red, and should not smell burnt. If it looks or smells burnt, have your transmission fluid flushed. Letting it get too bad can damage your transmission. There's also a chance that you may have an internal transmission problem, especially if you are having problems with shifting or engaging in gears.