June: As a preventative maintenance expert you should know regular charging will prolong the life of the battery quite a bit. They can last 15 years if kept well charged.

This is normal. It depends how the engines tuned also. I assume your Saab requires premium fuel which would contain more energy than regular and would even out the winter blend a little more. The energy content of premium fuel is actually lower than regular grade, but it is small amount, something ...

Next time you drive somewhere, just parking, or waiting for someone; just turn off the radio and turn the volume knob back and forth a million times. I'm guessing the knob gear is dirty, so just spin it for a bit and see if you stop getting the spontaneous increase.

Well, you let oil get on -that rubber part.

I think 3 years might be a record for a URO PCV , well done there.