I've got a 23 F150 3.5 Ecoboost with a little over 30k currently. I plan on doing some preventative maintenance this spring to include front/rear diff fluid changes (Amsoil 75w90) and transfer case fluid (Amsoil ATL).
For the transmission I plan on doing a simple drain and fill every 30k or so since that seems to keep them happy. I lean towards Motorcraft ULV since that seems to be the common choice among many (even high performance builds) and it's a whopping $24 for 5qts off Rockauto. Though I wonder if a more premium fluid like Amsoil ULV or HPL Teal would be a better choice for long term? If I go with Amsoil or HPL, would it be fine to mix with OE fluid doing a single drain and fill (about 1/3 of total fluid capacity)? Surprisingly there's not a lot of 10r80 discussions on this forum for as many as there is out there and advice on F150 forums is pretty much one sided. Since I have Ford ESP for 8yr/125k, I also wonder how something like HPL Teal may affect warranty coverage if there is an issue and what they drain is a drastically different color.
EDIT: I should mention that I do have a bit of an odd shift from 1-3 that seems like it doesn't fully engage after it shifts and occasionally the same behavior from 3-4 and 4-5. I have had a hard downshift into 3rd while slowing down a couple times, but I haven't been able to figure out the conditions to replicate it. Most people wouldn't notice and don't notice it, but as previous tech that focused on drivability it stands out to me. I don't expect perfection, but better than it is now. I've read others with similar experiences are better after fresh fluid.
I don't plan on extensive heavy towing or hauling, just regular driving with some truck duty here and there as needed. I am planning on a tuner and intercooler at some point. I'm undecided if I get PPE pan with a drain plug or not yet, but I'll probably bite the bullet so it's easier maintenance in the long run.
For the transmission I plan on doing a simple drain and fill every 30k or so since that seems to keep them happy. I lean towards Motorcraft ULV since that seems to be the common choice among many (even high performance builds) and it's a whopping $24 for 5qts off Rockauto. Though I wonder if a more premium fluid like Amsoil ULV or HPL Teal would be a better choice for long term? If I go with Amsoil or HPL, would it be fine to mix with OE fluid doing a single drain and fill (about 1/3 of total fluid capacity)? Surprisingly there's not a lot of 10r80 discussions on this forum for as many as there is out there and advice on F150 forums is pretty much one sided. Since I have Ford ESP for 8yr/125k, I also wonder how something like HPL Teal may affect warranty coverage if there is an issue and what they drain is a drastically different color.
EDIT: I should mention that I do have a bit of an odd shift from 1-3 that seems like it doesn't fully engage after it shifts and occasionally the same behavior from 3-4 and 4-5. I have had a hard downshift into 3rd while slowing down a couple times, but I haven't been able to figure out the conditions to replicate it. Most people wouldn't notice and don't notice it, but as previous tech that focused on drivability it stands out to me. I don't expect perfection, but better than it is now. I've read others with similar experiences are better after fresh fluid.
I don't plan on extensive heavy towing or hauling, just regular driving with some truck duty here and there as needed. I am planning on a tuner and intercooler at some point. I'm undecided if I get PPE pan with a drain plug or not yet, but I'll probably bite the bullet so it's easier maintenance in the long run.
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