Not on the 2.0 but on the older 2.5. There's no gasket or O-ring under the join between the dipstick housing and the block. Fixing bolts only have to loosen of minisculey or (more likely) the sump overfilled slightly with oil and the extra pressure forces oil out through the join.
I made the mistake of tightening mine up slightly to try and fix it...and the damn thing cracked but not to my notice until the leak got worse..
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