In a word, YES! If your vehicle is overheating, serious and costly engine damage could happen. When it is safe to do so, pull over to the side of the road and turn off the engine. This will begin to let the vehicle cool down.
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That depends. For high output, supercharged or turbocharged engines, synthetic motor oils might be the better option. Many vehicles that are used for towing (especially in the hot summertime) and those that operate in extreme temperatures use synthetic oils.
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