Hi,
On S32K116, CAN clock accuracy of ±0.5% cannot be guaranteed using internal oscillators alone. The internal FIRC is specified at ±1% over voltage and temperature, and no runtime calibration or factory trim variant exists to improve this. To meet ±0.5% reliably and compliantly, an external oscillator or crystal via SOSC is required, to be used as CAN PE clock.
BR, Petr