SAAB oil filler neck. A simple thing to change. A couple of hoses and one 10mm bolt. Done. Hardly got dirty.
I changed the spark plugs just before I did the oil filler neck.
The old ones had 70000km on them. That’s how many km I have put on the car. I changed them once I got the car 3 years ago.
Video here: https://youtu.be/wL5PeXUqAF8