discool
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Taken from the Discovery 2 workshop manual
Engine oil - Td5
Use 5W/30, 5W/40, 5W/50, 10W/30, 10W/40, 10W/
50 or 10W/60 oil to specifications ACEA A1/B1,
having a viscosity band suitable for the temperature
range of your locality.
This is suggesting A1/B1 oil to promote fuel efficiency and makes no mention of synthetic / semi synthetic.
It's just a repeat of the oil specs for a D1, which was a repeat of the spec for the RRC so no change there, it states the important bit's so there's no more to know is there? other than oil technology has improved somewhat since the days of RRC, D1-2.