It depends on the lock design I think, as I said if the gunk has no where to go it will turn into liquid gunk and get into all the tiny crevices. General consensus is that if you need lubricant to help operate the lock, the lock is close to failing completely. Ignition locks being the most obvious example. I think it was mentioned somewhere that ATF is the best liquid lubricant to use, as it does not attract dust or some such thing. Theory would suggest that a keyless entry vehicles lock should be cleaner than the older style turn the key to open, as there is potential for dirt entry every time you use the lock.

Hendrik
who is theorizing again

On 26/03/14 10:05, arche...@embarqmail.com wrote:
Local semi-retired locksmith advised several years ago that WD-40 was the best "lubricant" for locks. I don't know if it affects a locks longevity, but since then a squirt in my locks has solved all problems.
Gerry


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