I have a 2018 Tradesman with the CTD with the EVIC gauges. While driving the other day I noticed the oil temperature varying a good bit. It would go up to 195 and then drop to 177 and slowly go back up and drop again. Water temperature would rise to 192 then drop back to 188. I understand the water temperature varying as it was cool outside but I haven't seen the oil temperature varying this much this fast. Does it have a separate sensor for temperature and pressure? The oil pressure never varied except with rpm. I read in a search that oil temperature was just an algorithm produced by one of the many computers onboard. Is this true? I'm going to try it on a warmer day and see what it does but I haven't noticed this before. I appreciate any information. I don't really want to have to take it to the dealer. It still has less than 4K miles on it.