Hello Ron,
Calibration is rather a technical word for what is actually just an artificial known good value applied to the module that monitors the oil level, to prevent it from generating oil level warnings caused by changes in the sump level during draining and refilling, until it has had the opportunity to restabilise itself.
In short, if you are 100% happy that the engine has been refilled with the correct amount of oil, you can ignore any oil level warning that might appear shortly after the oil change. According to VIDA, the level monitor should stabilise itself after the car has been driven at least 30km and then parked on a level surface with the engine switched off for at least 5 minutes.
But if you are in any doubt, the only safe option is to drain the oil and start again, filling with a known correct quantity, otherwise you could risk serious damage if the level is actually incorrect.
All the "calibration" does is to suppress any spurious oil level messages in the interim period. But only garages with access to Volvo diagnostic equipment will be able to carry out that procedure.
I believe reduced engine performance messages can also be linked to the oil level warning if the car considers that the oil level is seriously under or overfilled. If so, they should also disappear once the level according to the car software has stabilised.
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