Last Update:
Rear Diff Temp light off now...even when I cold start the car...Becoz of raining day, outside temp around 13c degree (55~60 F), So I think maybe the Motul 75W90 is ok @ this point, but lower temp (like around 8C degree ) will make the oil thicker and Rear Diff light is activated...for the first 1~2 KM driving..