Don't know if it's normal but my 80 300SD does it.

I replaced my cap a few years ago because I noticed some leakage. The new cap leaked as much if not more than the old one so I just decided to wipe it off every few weeks and not worry about it.

__________________
Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD