2021 ST with 30,000 miles. Lot of highway use; minimal towing use.
Would strongly recommend changing the transfer case and front differential fluids at, or before, 30,000 miles. Trans fluid and rear differential fluids looked in good shape (changed anyways) but the transfer case fluid was starting to turn from pink to brown and the front differential fluid was just plain ugly! I think the small capacity of these last two is why the oil deteriorates so much.
The front differential is (relatively) tiny and holds 0.6 quarts (75W140) so it definitely has a hard, hot life. I plan on changing it again in 15,000 miles for sure.
The transfer case is only 1.1 quarts (MERCON LV) and also sees a pretty hard life.
All are easy access for the changes but the transfer case drains all over the cross member and the front diff torx plugs (why use Torx here when the others are 3/8" square drives?) seems to have been installed by Thor and were a PITA to remove - long extension bar needed on both plugs.
Would strongly recommend changing the transfer case and front differential fluids at, or before, 30,000 miles. Trans fluid and rear differential fluids looked in good shape (changed anyways) but the transfer case fluid was starting to turn from pink to brown and the front differential fluid was just plain ugly! I think the small capacity of these last two is why the oil deteriorates so much.
The front differential is (relatively) tiny and holds 0.6 quarts (75W140) so it definitely has a hard, hot life. I plan on changing it again in 15,000 miles for sure.
The transfer case is only 1.1 quarts (MERCON LV) and also sees a pretty hard life.
All are easy access for the changes but the transfer case drains all over the cross member and the front diff torx plugs (why use Torx here when the others are 3/8" square drives?) seems to have been installed by Thor and were a PITA to remove - long extension bar needed on both plugs.
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