Drain locations on 991?

[Haribo Lecter]

My car had a bad smell of “oil” in the cabin, not found anywhere else in the car, except from coming out of the air vents when the car’s had a good run.

I had the drains cleared during a service and this seemed to clear it for 6-9months but it’s back again now.

I’ve lifted the plastic covers in the trunk over the battery and cabin air filter but I can’t see anything resembling a drainage plug, or anything that might be holding something stinky.

Any ideas?

[David W.]

There are 2 air filters associated with the air system. One in the frunk and one under the glove box on passenger side. Both can be checked / changed fairly easily with YouTube help. If these are old they may be your problem. Clean air boxes with soapy water whilst your’re in there.