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Climbed Wolf Creek yesterday heading east moving the 5th wheel (16k +#), locked 6th gear out and had to hold back on the go pedal. 6.7 is a beast and justs wants to keep gaining speed on the climb, the newer 6.7s and 10 speeds must really shine on these climbs.
Snapped a couple pics of the guage screen on the climb up the mountain and the oil temp did flash 251f briefly a couple times but max temp was 249f mostly. The tranny temp barely rose the entire climb and held at 207f.
Just right of center for coolant is about 220. So I would imagine coolant temps got as high as 230F. About that I would get on my 2013 when climbing Monarch pass or the Eisenhower tunnel.
With your oil temp so high, I'm very surprised to see the transmission temp so low. I've never seen 248° F on my engine oil temp. I sure would like to see it stay lower, but I'm reluctant to start installing aftermarket parts.
Looks normal to me. A couple summers ago when it was very hot across the USA, I saw similar temps on the oil and water while towing from Alabama to the West Coast. The temps would go rise when going up the mountain and then drop as we went down the other side. Never did lock out any gear of the 6 speeds. Use the cruise also at all times and the 2015 6.7 never missed a beat.
Went over several high mountain passes pulling with my ‘15 and my ‘16 with 18,000 in tow. All during mid-summer heat. The oil temp once or twice spiked up around 250. The coolant “gauge” would climb to the right of center; but never anything to cause worry. Yup, they are a beast.
This is actually the first time I notice over 249f after 5 years and many mountain passes. Soon as you crest the mountain and start the decent the temp drops nicely. Yes, these 6.7s are beasts of engines.
I loved the V10 with 4.30s pulling the trailer but after being in the diesel I'm spoiled with the pulling power. I'm sure I'll change my mind when a repair comes due but you never know maybe it won't happen.
Looks normal to me. A couple summers ago when it was very hot across the USA, I saw similar temps on the oil and water while towing from Alabama to the West Coast. The temps would go rise when going up the mountain and then drop as we went down the other side. Never did lock out any gear of the 6 speeds. Use the cruise also at all times and the 2015 6.7 never missed a beat.
Reasoning for locking 6th out while cruise was set is it gets old losing 5 mph before it catch's up to set cruise speed or get stuck behind the inch worm with not enough truck/ to much trailer in short passing lanes, easier to just turn off 6th before base of climb and hold speed the entire way.
Just remember the 6.7L squirts oil at the bottom of the piston to help cool the pistons. So on a hard climb with lots of turbo boost and the combustion temps (EGTs) being high, The Oil Temps jumps.
I've frequently seen 242° - 244° over the last 10 years on pretty much any mountain climb
Just remember the 6.7L squirts oil at the bottom of the piston to help cool the pistons. So on a hard climb with lots of turbo boost and the combustion temps (EGTs) being high, The Oil Temps jumps.
I've frequently seen 242° - 244° over the last 10 years on pretty much any mountain climb
I didn't know that that's why the oil temp rose. Thanks
Wolf Creek Pass is a high mountain pass on the Continental Divide, in the San Juan Mountains of Colorado. It is the route through which U.S. Highway 160 passes from the San Luis Valley into southwest Colorado on its way to New Mexico and Arizona. The pass is significantly steep on either side (6.8% maximum grade) and can be dangerous in winter. There are two runaway truck ramps on the westbound side for truckers that lose control of their brakes.
I've been up Wolf Creek Pass from the South Fork side, but only up as far as the ski area. We were fishing in the area a little too early in the spring season and were looking for lakes that weren't iced over. Pretty slim pickins in late April that high up. I should have brought the ice fishing gear, not the fly fishing gear.
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I'm sure I'll change my mind when a repair comes due but you never know maybe it won't happen. 
