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That makes sense, I did 2 drains and refills at 35k. The original factory fluid was black, and after the first drain and fill, taking it for a drive, the fluid was clear purple. After the second drain and fill the fluid was bright red. Yeah, it’s a lot of fluid expense, but worth the effort...

So you’re saying the dealership did a flush with the existing dirty fluid and never drained and filled it with clean fluid? If they did actually flush it, where did they connect the flushing machine?

I’m doing the drain and fill every 30k. It’s very easy and cheap to do.

The original first fill plug from the factory was not magnetic, but the drain plug is magnetic. I replaced both plugs with magnetic versions as Ford recommends the Service Manual. I ordered the two plugs at the dealership parts counter, only a couple dollars each, and I believe it was with...

I do 30K fluid changes on the RDU, PTU and Transmission, pretty easy to do. Many on this forum have voiced their opinion that 30k is too short of an interval for those components to have fluids exchanged out. I believe they are high heat and load bearing fluids, and I would rather use shorter...

Not knowing vehicle exact age and total miles driven, some things to consider checking (not on your list): Check battery life and manufacture/source; check rear diff fluid/ the RDU fluid / and transmission fluid. Service/replace these as needed.

Yes, you can do the BMS reset it any time after you drop a new battery in, takes a couple of minutes. I did it after I swapped in a new battery (before the recall came out) and it's been working fine.

I'm planning to do that this week. I've already brought back the battery core to parts department at my dealership and got receipt for that, plus I purchased the new battery from same dealership. Hopefully they will reimburse me.

Normally, I replace my batteries in our vehicles every 3 years. I recently replaced our ‘21 BS BB at 3 years and 3 months, easy to do, and requires you to reset the BMS system (very easy). The only difficulty was availability for the exact Motorcraft Battery, took 6 days to order one, apparently...

‘21 BB 39k, only one recall on the water pump and that’s it. We have an extended warranty but we do all the maintenance ourselves, based on shorter service intervals than Ford recommends. I have studied everything I can get my hand on about the vehicle (service manuals, TSBs., etc). My advice...

I fall under the Special Operations Schedule and do the 30k mile interval because I tow several types of trailers. And use same interval 30k mile interval for the PTU and the RDU. The transmission, RDU, and PTU each have different fluids and are the backbone of my power train. We live in a very...

Then don’t do it, and see how long your transmission lasts

You MUST change the fluid every 30k miles minimum. There is no changeable fluid filter on this transmission, its internal. The process to change the fluid is fairly easy, remove the under-engine cover, and remove engine air filter box. Locate the drain plug under the transmission, remove the...

Replacing critical fluids myself since day one has been easy and cheaper - engine oil every 5k mi, transmission oil every 30k, PTU/RDU every 35k. All of those maintenance actions done together at our dealership is generally over $1k. Doing it yourself cost is around $180-200. The PTU oil (1 qt)...

Mine is a 2021 Big Bend, 1.5L, 39,700 miles, religiously change oil and filter every 5,000 miles. I do all the maintenance on it, including transmission/PTU/RDU fluid changes, it’s a surprisingly easy car to work on. Transmission fluid at 30k intervals, PTU and RDU at 35k. Only thing we had was...

Yes I did, it was actually 175 lbs tongue weight. I basically tried to load it with 60% in front half of trailer and remaining 30-40% in back half. I had no problems at all with fish tailing or instability, towed perfectly. I usually use my 2018 F150 for towing but decided to give the Bronco...

Just made my first long distance tow with our 21 Bronco Sport Big Bend 1.5L at the 35k mark, turned out to be very successful, mainly because I prepared the vehicle properly with these steps: - Installed a Curt Class III Hitch and Trailer light wiring kit from etrailer.com using the several...