All vehicles with internal combustion engines require periodic maintenance to keep ticking. Internal fluids need frequent checking and replenishment under the hood, so inspecting all engine fluids weekly or before embarking on a long drive is an excellent idea. For instance, the coolant needs replacing at least once every 30,000 miles or three to five years (whichever comes first), although early flushing reaps more benefits in the long run. The same goes for the automatic transmission fluid (ATF), which
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