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

On 3/25/2014 5:23 PM, Dan Penoff wrote:
Just order a new key from the dealer with your VIN.  Cheap, and you'll be sure 
that it's the right key.

NEVER, EVER put oil in a lock.  You will make a mess of it for sure.  Get a 
tube of graphite from your local hardware store, or rub a pencil lead all over 
the key (powered graphite works much better.)

Dan


On Mar 25, 2014, at 3:43 PM, Randy Bennell wrote:

On 25/03/2014 2:23 PM, Van Knutson wrote:
Just for shats & giggles, I, for the first time since buying the car 4 yrs ago, 
put the spade key in the door instead of using electronic ingress as usual.  It fit 
but gave no inkling of turning / unlocking the car.

I confess testing the physical key in the door didn't occur to me @ time of 
sale. Is it possible that, the tumbler had filled with crud after not being 
penetrated in god knows how long (it was 10 yrs old when I bought it in 2009 
and may never have been tested for all I know), or that the key / tumbler combo 
was a mismatch from the getgo?  I don't want to go around wantonly spraying 
WD40 everywhere and really mess things up.

I am nervous in that I am one dead wristwatch battery away from being 
permanently locked out of my car.

99 E 320


Maybe talk to a locksmith?
I had an issue with one of the deadbolts on my house and took it to a locksmith 
with the intention of buying a new lock like it as I thought it was worn out.
They looked at it and suggested all that it really needed was good lubrication.
They sold me a small but expensive bottle of oil that they recommended and I 
did what they suggested.
Has been several years now with no problems.
I should probably lube it again while I am remembering this.

No idea if some lesser oil (or Mobil1) would have done the trick but the advice 
from the locksmith was free so I think I more than broke even.
He could just as easily have sold me a new $100 lock.

Randy

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