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If you have just bought a new car or have owned your car for a while, it is important to keep an eye out for fluid leaks. Fluid can leak from a number of places and sometimes it is not an issue but other times it is a warning that something is not quite right.
The best way to spot a fluid leak is to look under your car when you drive away. You may need to pull up a little further down the road to inspect any fluid that has been left. If it has been raining then the fluid may just be water that has cascaded down the engine, but if the weather is dry you may need to do some further checks. Having the heating on or your air conditioning can cause condensation to drip down on to the floor once the car has stopped. This should look just like water.
If you notice that the drips have a greasy feel to them or you can see a rainbow colour then it is most likely some sort of oil. The oil could of come from the engine or from the transmission. You need to try and fine out where it has come from. If it is a new car or new to you, you may still have some sort of a warranty on it. If this is the case then contact the dealer that you bought it from. If not or you bought it privately, then you will need to take it to a garage for them to investigate.