Check for water leaks, at the Floor of the bonnet, left en right compartiments. Check if the Floor under the front and rear Seats are dry.

Check if the valve cover is leaking, at the rear left, there is an small ridge, from there oil will drip on the catalysator.

Check te State of the multi belt, if there is a leak from the OFH it will destroy the belt.

The oilpan gasket is a serios DIY PIA to replace, in the shop a very expensive job.