I'd open it up
To see if the oil is leaking out of your Turbo Charger,if its not, no big deal,if it is your charger may be ready to grenade, or the drain pipe is restricted. This issue can cause a run away engine. You also need to pull the lower inter-cooler boot to see if there is a large amount of oil in the bottom of the intercooler,a small amount of oil is normal. Take the air-intake boot off and check the play of the inducer turbine, a tiny bit of play is normal. Its real messy if it grenades on the road.