Hello,

I see on the forums here that the red line full synthetic 75w90 hypoid oil recommended for the diff. It also looks like others are recommending this for the 6 speed manual transmission as well? Or am I reading this wrong.

Doing some research Pennzoil platinum and ultra Platinum oils are made from group 4 and group 5 synthetic base oils vs most full synthetic are based on varying amounts of group 3 base oils.

​​​​​​As long as the oil is 75w90 and contains friction modifiers for the diff I intend to use the Pennzoil.

However here is my question. I see that most hypoid limited slip diff oils specifically state DO NOT USE in syncromesh transmission??? Yet it appears in certain threads the redline oil is recommended for both?