Is this OEM?

[mnahon]

Does anyone know what feature of a gas cap is different between vented and unvented versions? It would seem to me that if it's simply a hole drilled somewhere, that you could plug that hole to convert from vented to unvented.

[MikeSimon]

Many times, the vent is done through the lock. Would be difficult to plug. And then, why would you want to plug it?

[mnahon]

Since our caps are supposed to be unvented, if you ended up buying a vented cap, you might want to plug the vent.

[Pawel66]

Pawel, are you referring to that round feature at the bottom of the cap? That also seems to exist on some OEM caps, for example, the one pictured below. (I'm assuming it's original, just from its weathered appearance)

As far as rumours of installing a double-sided key barrel into a cap intended for a single-sided key barrel, it would be great to hear from someone who's actually done this. Generally, double-sided barrels (for doors etc) are larger diameter than single-sided ones. So for example, there's no way you can install a double-sided barrel in a door handle originally intended for single-sided key because of the differing diameters. The two-sided barrel is bigger to accommodate wafers on both sides of the key.

See how some of the theories can go to trash...

Is it Ymos too?

As for the cylinder (barrel) I am talking based on my experience with other locks in the car (I was re-creating sets of locks for 190SL form 1956 and Ponton from 1960). I never  got into gas cap - I bought from the dealer about 10 years ago an original cap with lock cut to my key from data card for my Pagoda (it is in the drawer now, I use aftermarket one for every day), 190SL had vented cap with no lock and Ponton has door lock for fuel door. So I do not know if it is possible to change gas cap lock from asymetric key to symetric key. It is probably possible to cut the cylinder to the key if it has the correct profile.

[mnahon]

The key that came with that gas cap, pictured below, is a Silca key with a TV profile (Silca YM5). I assume it's an aftermarket key. I also attach below a pdf of key equivalences, in case anyone's interested.

[zoegrlh]

Looks original. If it is, it’s like gold. Hold on to it.