Mine averages between 180-210 deg.....Im lucky enough to NOT have to negotiate stop-n-go traffic.

Most highway riding (recent trip in early May) has been about 190 deg.....will know more this weekend.....first 'summer' trip.

Billy G

 

On another forum, a guy who lives in Arizona sent the oil from his '09 Ultra to Blackstone for analysis. He was regularly seeing 300 degree dipstick temperatures. With Mobil 1 (and IIRC, not their V-Twin stuff), there was no significant breakdown after 5,000 miles.

What that tells me is this....Our bikes were designed to run hot, and all we really need to do is change the oil regularly. If it helps you sleep better at night, run an oil cooler. But if you really want to know what's going on, send an oil sample to Blackstone. It costs all of $25, and it'll dispel an awful lot of internet myths.

FWIW, I have a Jagg mounted on the downtube of my Night Train, and the Limited came with a cooler. I run Amsoil 20W-50 in all but the winter months (when I go to 10W-40), and I couldn't care less what temperature either bike runs at. In 90+ degree temperatures on Sunday, I had no issues with the Night Train (which is running 10.5:1 compression) in the Rolling Thunder traffic jam on Sunday.

People stress way too much over oil and operating temperature as far as I'm concerned.

 

Water, which is a byproduct of combustion, will evaporate at any temperature, but does so slower as it decreases. Put a small pan of water on a stove and heat it to 180°, then measure the time it takes to evaporate the water. Do the same for 150°, 120°, or whatever and it will still evaporate--just slower.