Everything, even the smallest of things, can affect the performance of your engine. Whether topping off your fuel tank or driving on motor oil past its expiration date, you're slowly killing your car.

Car maintenance can be as difficult as it is messy. This is primarily because there are just so many fluids involved. Fluids of the darkest, stickiest, most potentially dangerous sort, in many cases.

Under normal circumstances, most modern engine oil and gasoline brands work fine on their own to keep your engine running smoothly. But there may be cases where even the best of them could use a ...