small hole near tiop of oil dip stick tube ?

[cf]

Hi,

Our '97 C280, c202 M104:

On dip-stick tube, about 1cm below the rim, is a small (1-2mm dia.) hole.

Quite sure it has always been there but this is first I notice.

Anyone know why a hole is put there by MB?

Thks in advance.

[Duke2.6]

I think it's just a vent hole so pressure doesn't build up between the O-ring and cap and unseat the dipstick.

Duke

[cf]

Makes perfect sense to me.
Looking closer, the hole seems to sit just below the o-ring on the stick platic cap/handle.

Thks.

cf

[Duke2.6]

The hole on my dip stick tube is just below the plastic seat of the stick which places it well above the O-ring when the stick is seated.

If the hole was below the O-ring the crankcase would be vented to the atmosphere, which would violate emissions laws that have been in place since 1963 in the US, 1961 in CA.

Duke

[cf]

Thank you very much, Duke.

Time to lift the bonnet again this weekend to quench my curiosity & get better acquianted with the little hole.

Cheers.

cf