Hey guys,

Hope this finds everyone well.

My 2.5T 2005 Volvo XC70 is a lovely car with 133,000km and has been burning oil at a rate of about 1 quart per 1,500km.
I bought it second hand at 123,000km and as far as I can tell from the receipts, it has been serviced yearly/15,000 km intervals with Mobil 1 fully synthetic 10w40 High Milage.
We changed the oil grade from Mobil 1 10w30 to Mobil 1 10w40 High Milage after I found that it was burning oil so profusely and also because of the Australian summer which commonly hits 40+ degrees celcius.

There is no leak under the car or on the ground where I park it.
No smoke from the exhaust at ignition or whilst driving.
No oil splattered on the engine.
No white deposits under the oil cap.

1. My independent mechanic believes its the turbocharger ($2000+)
2. Dealer thinks its a partially blocked breather box (from the research I've done on the forum I'm guessing that this is the PCV system? please confirm) and replacing this will be $900. They have written on the invoice to "replace soon."

At this stage, after reading on the forums and research I'm leaning toward getting the breather box replaced by the dealership.
Could anyone give me some more insight and kind words before I pour some more money into my beloved Volvo?
Any way to confirm?

Not confident and do not have tools to DIY - would like to leave to a pro.

Thanks for your time and have a great day.