Renault: Df084 Better Repack

"Use thicker oil to stop leaks." Truth: The DF084 has tight bearing clearances. Thicker than 5W-30 causes oil starvation, especially to the variable valve timing unit (on later models) and the turbo. Use exactly RN0720 5W-30 or 5W-40.

Pre-heater circuit malfunction (often glow plugs), common during hard starts.