You don't state what year you TD4 is ?
2000-2003 - 10w-40 or 15w-40 ACEA A3/B3 .
2004-2006 - 0w-30 , 5w-30 , 5w-40 , 10w-30 , 10w-40 , 10w-50 , 10w-50 ACEA A3/B3 . Depending on temperature were you live .
Engine oil temperature ranges
0W/30 will protect from -30ºC (-22ºF) to 35ºC (95ºF).
5W/30 will protect from -30ºC (-22ºF) to 35ºC (95ºF).
5W/40 will protect from -30ºC (-22ºF) to 50ºC (122ºF).
5W/50 will protect from -30ºC (-22ºF) to 50ºC (122ºF).
10W/30 will protect from -10ºC (14ºF) to 30ºC (86ºF).
10W/40 will protect from -10ºC (14ºF) to 50ºC (122ºF).
10W/60 will protect from -10ºC (14ºF) to 50ºC (122ºF).