Where WD-40 Works — And Where It Quietly Ruins Car Parts

WD-40 Maintenance Secrets That Extend Your Car’s Life

Imagine a spark plug boot swelled up 40% after one WD-40 spray and is now dumping 40,000 volts into the engine block and triggering a phantom misfire that eats $500 in coils. Yet, mechanics use the same WD-40 to free seized ignition cylinders. Same can, same tool - one application prevents a four-figure nightmare, the other creates it. Today, I’m mapping the exact WD-40 safe zones and the contamination zones that silently create expensive failures.

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