for completeness of information.
the message with 0x488 address is sent 10 times per second and is composed by 8 byte of data with the following meaning (at least for the MEVD17.4.4 ECU):
Byte 1: water temperature: you need to add +40°C to get the real temperature in °C
Byte 2: volumetric fuel consumption: you need to multiply the value by 80 to get the volume in mm^3
Byte 3: requested engine idle: you need to multiply the value by 8 to get the RPM
Byte 6: oil temperature: you need to add +40°C to get the real temperature in °C
Byte 8: boost air temperature: you need to add +40°C to get the real temperature in °C