"Passive regen happens whenever exhaust temps exceed approx. 1,076 degrees F without a fuel consumption penalty. Active regens occur when the DPF sensor triggers a burn off and requires the engine to force higher exhaust temps, 1,076 to 1,200 degrees F." This is out of Diesel Power Mag., from the mouth of Charlie Freese a GM duramax engineer. I'm guessing our motor is close to the same. 
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2008 F350 CC SRW LONGBED Larait, moonrf, pwr slider, tow comm., backup cam.& sensors, camper pack., chrome pack.,audiophile, 60/40, 3.73 LS,stock 6.4, Torreador Red/Silver accent, Ride-rite air bags 2071 and 2219 controller,torklift stable load bumpers, dieselsite external tranny filter kit, duraflaps front and rear, Line-X, A.R.E. Z-series canopy, keyless entry, fold-down front slider, 2 lights. Tork lift camper tie-downs, Fast-Guns
10'2" Citation Supreme w/slide & all opt.s
1978 F250 Hi-Boy supercab 4wd Camper Special , 400, Edelbrock Performer 600 carb & intake, 4.10 LS, C-6, custom autosound radio, new interior, 68,000 orig.
1978 F150 reg cab xlt lariat trailer special 400 stock
1970 Torino Cobra 429 CJ C-6 13.02@ 103 1/4 mile, 3.50 Trac. Lok
1970 Torino GT Conv. 4 speed 351C 2bbl
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