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6,000 pounds is light for your truck. I had just over 300 miles before towing 6000 lbs. I didn't need to rev it hard to travel to Florida. It rarely downshifted. Towing the same trailer, it got slightly better MPG than my 2014 EcoBoost. I think it matters more how you treat it after 1000 miles. I have 20,000 now, and rarely rev beyond the 3800 RPM max torque. Runs great, never had to add oil between changes.
Put several hundred to 1000 miles on it to make sure tires are good and other parts are all in order. I doubt the truck will relay back to Ford saying you towed before the odometer hit 1000.
Order now, or see what they will do in February. They usually take less than 2 months to come in but the 2020 had some revisions to the 6.7 and a new motor option with the 7.3L so it may be taking longer initially as they had to retool the plants some id image. I found a good dealer nearly 80 miles away. By the time it had been driven to get Xpel, the ceramic coating shop, and bed cover it had almost 100 miles on it. I had 350 miles on it before the first weekend and live close to work.
Different manufacturers have different break in procedures, maybe that where differing opinions come from. I recall my friend telling me that the manual for his RAM diesel, said that towing a load will help speed up the break in process.
I feel comfortable following what is suggested in the Ford manual.
...said that towing a load will help speed up the break in process.
I feel comfortable following what is suggested in the Ford manual.
That would be odd. Anyone who has done aftermarket gears can tell you that all manufacturers specify a break in for the gears that includes some low-speed, low load driving to get some heat in the gears, a complete cool down, another heat and cool down cycle, then normal use for a couple hundred miles before banging on them. There might be a bit of variation on the theme from manufacturer to manufacturer, but they are all basically about the same on gear break in.
As has already been pointed out, there are a lot of SD owners who are pulling heavy the day after they get their truck. And there are quite a few commercial users who beat on these things as they drive them off the lot.
If I could, it would follow the break in advice. If I couldn't, then I wouldn't worry about it. As the age-old saying goes: Don't worry, be happy.