A few changes...
- DRL's
- Side air bags
- ETC.

Here are a couple of links:
- https://volvo.custhelp.com/app/manuals/ ... om_id/1076
- https://volvo.custhelp.com/app/manuals/ ... om_id/1078
- https://volvo.custhelp.com/app/manuals/ ... om_id/1077

Dang, I don't even know what that is.

Have you done the glove test?

Owners manual recommends 91+. I only use Top Tier stations when possible.

http://www.toptiergas.com/

Yippie! Head gasket jobs, my favorite. I'd like to start off by saying that you should never open the coolant reservoir with the engine hot/warm, it will cause coolant to back up into it. Also, you want to take a close look at the coolant reservoir cap to make sure it doesn't have any micro cracks i...

The small white gear is ok?

Probably a bad wire in the harness at the top of the cluster. I had to repair 4 of mine.

The pre '96 cars use one and the post '96 cars use another.

I drove around for about 2 weeks with my dash pad off chasing my broken wires.