Those numbers look right to me.

Are you in Europe? On our our US cars, the mixture is 'tamper resistant' and the 3mm allen must be accessed before mixture can be adjusted.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E