I own a 2003 V40 wagon, excellent condition, always properly maintained, just turned 100,000 miles. I am a believer in 3000 mile oil changes regardless of what the manual says.
The manual also says that it is not necessary, or possible, to service the Japanese made transmission. Logic tells me that after 100,000 miles that oil needs to be renewed, even if it is synthetic. Debris in the valve body, check ball wear, etc. are a concern.
So I went to my local Volvo specialist, and he said don't touch it if the transmission is functioning properly, which it is. Another Volvo specialist said it should be completely suctioned out and all new oil put in. My regular general repair facility said just drain and change 3 to 4 quarts for 3 consecutive engine oil changes in a row, An independent transmission shop refused to touch it stating that those transmissions are prone to break if you look cross-eyed at them, and that is why the first Volvo specialist would not touch it. Another transmission shop says they will do a complete fluid change no problem. The after market Haynes repair manual says drain what you can and refill.
Can you tell me, with actual Volvo design and repair facts, not just an opinion, what should be done here and why?