Oil/fuel leak ?

[Joker2]

Is it normal to have a little line of oil coming out of the cover seal of the outboard after it has been tilted in the up position for a long time ? The outboard was rebuilt and I only put 10 Hrs. on it last season running double oil. Just ran it for the first time the other day. Took a while to get it to stay running. Then today I see oil coming down my transom.