About a month ago when the weather started getting pretty cold, my car door locks were REALLY hard to turn. Things got so bad that one time on a pretty cold day, like 27 degrees, it took me about 2 minutes to get my car unlocked.

I'd previously tried the traditional graphite powder but that was of no real help. I'd previously put in lithium and that helped a lot for about 6 years, but then recently...... REALLY hard to turn the locks.

Desperate, I went to Walmart to get some silicone spray but found this stuff instead. I put this in and though it took over the course of a few days to work its way in, with me locking and unlocking the doors, the stuff has worked magic and the locks have never been this easy to turn.

The photo is upright on my computer but loaded up sideways. Sorry about that.

1991 300d, 255k

Attached Thumbnails

 

X2 Good stuff...

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

I love Fluid Film, but I have never heard of it's use in a lock cylinder. It is an excellent anti-corrosion spray for anything under your car showing any rust. It appears to soak into the rust and stop it's progression.

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'97 E 300 D

Lanolin based

FF is decent stuff. It will pick up dust, dirt, and grime, and it does wash out. But if left in a protected location it won’t dry up, and will work well for years.

I got the small tube of MB lock grease for my stubborn w126 locks and it worked wonders.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

Do you happen to have a part number for this?

By the way, I’ve had good success with Liquid Wrench Lock Lube & De-Icer, Part No. LLD03, for de-icing door locks on my car in the winter. The label says, “designed with CERFLON Ceramically - Reinforced PTFE”. A few years ago, I had a frozen door lock, and happened to be near a local auto parts store, and that’s they recommended. Fortunately, it worked.

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Marshall Welch
Seattle, WA
1982 300D-T

002 989 06 51 09

Availability is questionable through dealers. I got some maybe a year ago without issue though…. It’s not a deicer. It’s a lube for the tumblers and moving parts. My w126 had a real time with getting the key in and out of a door tumbler. Used this stuff and now it’s very smooth. A little goes a long way, worked in and out on a clean key.

Apparently VW stocks the same stuff.

G052778A2

You can read about it over on the 500e board:
https://www.*********.co/forums/threads/what-is-the-best-lubricant-for-124-lock-cylinders.12008/

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)