Deadbolt gets stuck!

[kds]

Ok, so I just spent about 2 hours reading thru the threads on locks. About a month ago I actually found a thread on locks getting stuck that described a product you could spray in your dead to loosen it up. Well, of course I relied on my brain to remember it (scary) and now I have forgotten. It's not WD 40 or graphite. I thought it started with L?????

Anyway, sure hoping someone out there can help me out. The deadbolt gets stuck while I am driving. I'm sure it's the vibration. If I wiggle long enough it will retract and I can open the door. No problems with the smaller lock above the deadbolt ( am I calling them the right things?)

Do I need to lock both of these locks while I am driving?

Thanks so very much any light you may shed!

kds

[HowieE]

I would take a look at the strike of the lock and see which side has a ware mark on it and file some material off the strike plate that is making the mark.

If the mark is on the bottom of the strike the problem will only get worse as the hinges ware. In time you may have to reset the door