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That's a something of exaggeration. At one point, it was just over half, but it's well under that now. And yes, European diesels operated primarily in the city often do have issues with clogged DPFs at fairly low mileage, although these issues tend to be a result of sensor problems...

Ordered 8/24. Today it has been 8 weeks, so I e-mailed my salescritter and asked for an update. His reply: "The estimated ship date from the factory is 10/20.. You're probably another 1wk to 2wks out yet depending on the transit companies." I'll take that with a grain of salt, but the the...

Remember when we first got catalytic converters on gasoline engines in the mid 1970s? They were a total PITA. But prior to catalytic converters, there were V8s making barely 150 HP. Manufacturers eventually figured out how to make catalytic converters work reliably with fuel injection and...

I most certainly do understand gearing. Can you make a 10 hp motor push the the truck down the road with the right gearing? Yes, but only rather slowly; it will never reach highway speeds, because 10 hp is simply not enough to overcome the drag one of these trucks has to fight at, say, 70 mph.

No, I'm not wrong. You don't understand basic high school physics. It take a certain amount of horsepower to push the truck down the road at a given speed. If both trucks are otherwise identical except for the axle ratio, then their engines are producing exactly the same power to keep...

Take two otherwise identical trucks, one with 3.21 and the other with 3.92 gears running side-by-side at a steady speed on the highway. Both engines will be producing exactly the same horsepower, but the engine in the one with the 3.21 gears will be turning ~20% more slowly. Lower revs...

Why does a certain Sammy Hagar song come to mind here? :LOL:

I would be really surprised if the tank didn't have a heater. I mean it's down there under the truck in the ambient air. What happens if you wanna drive 700 miles (instead of just 70) in really cold temperatures? The DEF in the tank would never thaw. FWIW, we just replaced the heater in...

Yup. Ever see all the black soot most any older (non-DPF) diesel makes when it's started cold? That still happens and it all ends up trapped in the DPF now. Short trips won't burn it off. To make matters worse, even the active regens that the ECU will use to try to fix the problem may...

Wait. I've never owned one, but people who do tell me that Toyotas never break and they certainly never leave their owners stranded! :LOL:

And then there are people like me who insist on getting the highest mileage (and thus range on a tank) possible at 80 mph on the highway, and hey, every bit of engine RPM you reduce helps there too. :LOL:

All this stuff adds up and helps them get better ratings from the EPA. This is critical; they have some "fleet average" numbers they have to meet, otherwise there are penalties. Because some people want it. There's no question that it puts more torque into the axles while the truck is in...

Ze Germans, zey are very precise in zeir requirements, und you vill follow zem, or else! :LOL:

Depends what you mean by "strain" and "wear / tear". 3.92 gears will result in higher engine, transmission, and driveshaft speeds; more rotations per mile on the highway. They are also capable (if you press hard on the loud pedal) of putting more torque into the axles in 1st and 2nd gear...

Anyone else here old enough to remember when any vehicle that could do 0-60 in under 10 seconds was considered fast?

This. Wanna win stop-light races? 3.92 Tow big/heavy things regularly? 3.92 Mostly highway at 80 mph without a trailer? 3.21

Manufacturers don't push this stuff on us because they want to. It's all driven by emissions and fuel economy regulations, which are in turn sanctioned by acts of Congress.

If you DIY it, what's the procedure for priming it? I.e. How do you get the air out of the system? I've had another brand's common-rail diesels for the last 11 years and on those, it's essential to use a scan tool to run the lift pump for a while to purge the air because the high pressure...

I test-drove two trucks before ordering mine. I'm happy that one of them happened to have the 8.4. I had planned to order the 12, but after seeing and using both, I changed my mind. Not only did the 8.4 look sharper, but it and the rest of the controls in that area of the dash were far more...