Service bulletin 2020-01 has been launched

Further to occasional field reports of oil temperatures suddenly running higher than usual, investigations revealed that one of the springs inside the oil thermostat had broken.
As part of our ongoing development policy, and to ensure correct operation of the thermostat for optimal and correct cooling of the engine oil, we have now changed the springs used in the thermostat and a mandatory replacement of these two springs is needed to ensure appropriate oil circuit performance, and with it optimal operation of the engine. More details can be found here

The spring kit can be ordered through your local ULPower dealer who can also assist you if you are feeling unsure about performing this procedure.