i replaced the transmission oil of my isuzu mu-x m/t 2017 model with a 15w-40 engine oil and the result was that the shifting from 1st to 2nd gear and from 3rd to 2nd gear became rough. also a noise occurred during morning start-up is observed. the recommended transmission oil for this vehicle per manual is besco transaxle 5w-30. you may also use 5w-30, 10w-30 or 15w-40 engine oil per isuzu mechanic instruction.

did you experience this?