Could be Fiat's negative logic.
On the Oil Degradation after an oil change reset it goes to 100% and then reduces from there. i.e. Oil Degration = Oil Quality where 100% = 100% good and 0% degraded.
On the Oil Degradation after an oil change reset it goes to 100% and then reduces from there. i.e. Oil Degration = Oil Quality where 100% = 100% good and 0% degraded.