What is the key doing? I would expect the driver's door lock to open the driver's door only on the first turn, and all the doors and tailgate on the 2nd turn CCW. This assumes your locks are 2 stage ones like ours are. Not sure what a valet key does. It may only open the driver's door not all doors....

as well as starting the car, valet key is usable for everything but unlocking trunk and glove compartment is my understanding. turn it twice left like scot850 suggested

i bought biggest rivets that fit my gun.

Turbo removal is not necessary, just undo the manifold.
Use gasket's cardboard to protect it while jiggling the repaired head around.

Somewhat related, is there an exploded parts diagram for volvos on the web? I've been using the manual at https://charm.li/Volvo/2004/XC70%20L5-2.5L%20Turbo%20VIN%2059%20B5254T2/ for this repair, but I miss the exploded diagrams that you can get for eg John Deere tractors like this https://partscat...

Beyond the variable valve timing solenoids, the very edge of the head? Mine has nothing there. (04 XC70)

If your car in a turbo then your can probably clean out the oil trap with carb cleaner or the like. However if your car is a non-turbo then there will be a vacuum control diaphragm that is integral to the oil trap. Those diaphragms get coked up to the point of failure making the oil trap a throw-awa...

If you have a lot of money, replace it. Otherwise, re-use it after cleaning with gasoline +/- carb cleaner as mentioned above. It is just a simple plastic box. Some years ago, I cut open the PCV trap (PN 1271988) in my 1998 S70, you can see the inside anatomy in this thread below. The design of P2 a...

Update. Changed oil and filter 2 days ago, added 5oz sea foam in with the oil. Oil pressure warning came on again 2x today (after about 40 miles driving). I guess pulling the oil pan is next. @Krons Thanks! Is the o-ring you're referring to part #37 in the attached diagram? From https://www.volvopa...

vida will give a more definitive code than that.
On mine it said "cam signal out of range", no kiddin, the cam sensor was loose, it couldn't get a steady signal.