[a2-16v-list] Overheating ?

[Steven Arguello]

Oil temp 245 to 260 in traffic. 225 to 235 on the freeway. How can I  
tell if the thermostat is opening?
It's been like this since putting in the 2.0. I remember the 1.8 ran  
cooler, 225 in traffic never past 240.
I'm guessing the radiator's old.
Thanks,
Steve