Have an 07 S60 2.5T 2WD and it's have an issue with long crank times to start. I checked the battery and that is fine so I put a fuel pressure tester on it and came up with theses values.

43 PSI @ Idle
40-43 PSI @ Acceleration
50 PSI @ During Turbo Boost
30 PSI @ Off
54 PSI @ Start - Then down to 43 PSI during acceleration

Been doing long crank times for the last 2 years was told by dealer it's normal. Now it stumbles when starting and the crank times are about 5 seconds now.

Any thoughts, maybe fuel pressure regulator?

Searched and found nothing really.

Thanks