Engine blocks have very thin paint to let the heat dissipate quickly into the air, and pressure washing strips it out very easily.
Get the replacement done now, and wash the vehicle once a month, preferably with a good old hose pipe and shampoo. Never wipe dry, only wet cloth. While chasis and engine blocks are rust resistant to a certain degree due to additives in the metal, it is not stainless steel or aluminium, and it will rust. Water will accelerate it.



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