I just bought a 2004 Expedition XLT 4wd with 109k on the clock. I want to replace all the fluids asap but wanted to ask on BITOG first for suggestions. Manual states: Differential F and R- 75w90 Transfer Case- Mercon ATF Trans- Mercon V Does anyone have any experience with non Motorcraft fluids in this truck? The Motorcraft synthetic 75w90 gear oil is like $20+/qt! I have also read places that Ford now recommend 75w140 synthetic as back spec. I appreciate any help on this as I want to keep this truck a long time and I love the feeling after replacing all the nasty fluid with fresh blood! I am looking to avoid spending mega bucks for the motorcraft if possible. I have seen Havoline Mercon V on Amazon for 49.99 for a case of 12. Is this any good? I have also seen many 75w140 synthetic oils for 11-12/qt (ie. Mobil, Redline, Lucas). Thanks.