My only experience is the B4184S2 (2002 V40).
Had the car for 2 years. Noisy VVT-hub from the start. They tend to do that.
Low fuel consumption, no oil consumption, starts equally well in summer as in winter temps down to beyond -40C. -Fires after the first rev.
Only trouble was in -35C where it wouldn't idle. Had to give it some pedal to make it run.
Lasted just a few minutes. IACV must have gotten stuck due to the cold. Never happened since.
Same low temp one year later, the starter solenoid refused to engage. A tap with a hammer and it started. Never happened since.
All in all a reliable engine.
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