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I'll chime in here to say I use synthetic along with the faster Canadian cold weather startup flow... I use it to provide better protection for the turbo....
Dino oil begins to break down and coke at around 300 degrees F. Synthetic up and over 350 degrees.
Exhaust gas temps over 1300 degrees is where the oil flowing to the turbo shaft bearings cannot cool enough that coking will start to occur. This is why it's important to keep those temps below 1200 or 1300 degrees.
Shutting down a hot turbo is where the residual oil in the bearings will heat up to the shaft temp and begin to coke. This may cause premature turbo failure later on as the hard coked oil builds up and will plug up vital oil lines.
This is why I installed a pyrometer and faithfully idle the truck until the temps drop below 325 degrees...
I'll get off my soapbox now....
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