To unlock a frozen door lock, use a graphite-based or bike chain lube instead of WD-40, says mechanic Bob “Motormouth” Weber.

Stuck door lock? Use graphite lube, not WD-40 Getty Image To unlock a frozen door lock, use a graphite-based or bike chain lube instead of WD-40, says mechanic Bob “Motormouth” Weber.

A: Although WD-40 is magic stuff, it is not the best choice to lubricate automotive door locks and linkages. Although it does a good job of cleaning and temporary lubricating, it goes away, so it ...

Graphite has long been a popular lube choice, but we like to use bike chain lube. Many of our readers and locksmiths swear by Tri-Flow lubricant. Q: Timing is everything.