Any reasonable 15w40 diesel oil in both the engine and gearbox. Neither the engine or gearbox is particularly fussy. I wouldn't be concerned about it being a different brand etc than whats in it.
I use Castrol RX Super, but mainly because I get it by the 20L drum for a decent price at the truck spares place close to work.
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
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