As long as the Ignition works, you can save the money. On my L251 (same engine), I had always some Oil on top of the Spark Plugs. Never had an Issue with that.
As far as I know, there is pretty much no EJ-engine, which doesn't have that Oil seal leak against the spark plug, no matter if new or old.
Just wipe the Spark plug connector clean when it has been taken out.
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Cuore L251 Bj 7/2003, Automatik:  Ausrangiert, leider!
Citroen C1 Automatik BJ 2011: 
Mofa: Dreirad auf Basis eines Amsler-Pony, Verbrauch Zweitaktgemisch: <3.5l/100km.
Das grosse Artensterben auf dieser Welt wird den Menschen erst bewusst werden, wenn schliesslich auch der Tiger im Tank ausstirbt.
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