for all those who service the 3.0 themselves

[Celes]

I use 5w30 GM oil, but I think the engine was happier with the Mobil 5w50. I'm tempted to try Total oil next...the engine ran great with their fuel. I wonder if their oil is any good

[m8internet]

I use vx 5w30 works out about £20 for 5 litres on trade club

Synthetic oil usually comes in the smaller 4 litre bottle
Semi-synthetic and part-synthetic can come in either 4 or 5 litres
All other grades come in 5 litre bottles

On the plus side, two of those is enough for the 3.0 v6 CDTI

[Celes]

GM oil comes in 5 litre bottles.

[m8internet]

GM oil comes in 5 litre bottles.

Not the ones I have been buying
As above, the semi-synthetic is 5 litres and the GM-LL specification is 4 litres
Bit of a con, as the 5 litres costs £10.80 and the 4 litres costs £11.43
When at the parts department the staff member brought the 5 litre bottle, I turned it round "er, that isn't GM-LL specification oil"

[Critch]

All the oil I've bought is 5 litres

[Cyruskint]

All the oil I've bought is 5 litres

Likewise