Hi, I recently bought a 2000 v6 mustang. I was wanting to change my fluids, specifically differential and manual transmission due to not knowing whether or not they've ever been changed. I tried looking into different sites like LMR and I keep finding different results for what fluid my diff would take. I know it's the 7.5 rear end. I looked up and found an owners manual pdf online which is saying that the fluid is recommended as 80W-90 but on LMR it says 75W-90. The manual I found also says...

Fluid maintenance questions