My oil temp sits between about 95-105 depending on how hard I'm going My water temp on the other hand is all over the place. When cruising on the freeway seems to sit at about 95-105, in traffic can be anywhere from 90-115 Have changed the thermostat housing, thermostat, crack pipe and flushed the system and replaced with new coolant but it still does it. I have no idea why it does it but it doesn't seem to affect performance at all. I was very worried about it at first but it seems to be normal for this car?