1950s Classic Cars at a Gas Station, U.S.A

Why are they putting oil and water into a hot engine ? ..
It is OK to put oil into a hot engine. As for the water, some caution should be taken. Putting cold water into a hot engine can cause the block to crack. An engine may overheat at any time of the year, if the thermostat becomes stuck closed. This may cause the engine to overheat, so putting cold water into it may cause the block to crack. If it's a hot day and the water has been sitting outside, then it shouldn't be a problem.
 
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