Assuming its petrol remove the plastic cover/fan support from the top of the engine, disconnect fan electric connection under the bonnet first, don't lose spacers under bolts and use loctite on threads when replacing bolts.
Turn ignition on to run the fuel pump and pressurise fuel system, turn ignition off and check the fuel hose and connectors to the injectors for leaks/weeping.
If its oil could be front crank seal or starting the engine after wet sumping and blowing some oil out of the breather/ air filter.
