[Filters & Oil] This or that oil

[Islander71]

I have 10ltr of (new) 5w-30 synthetic C3 oil left over from my previous vehicle or also some 10w-40 semi-synthetic A3/B4 I keep for my campervan. Which would be the better oil to use in a 2003 DW8B 1.9d ? I'm assuming the C3 is an improved, higher grade than the B4?
The engine has done 68,000 miles.
Thanks.

[ffrenchie]

The C3 is what you would get in a service kit for the 1.9 so it is obviously the one to go for.

[Islander71]

The C3 is what you would get in a service kit for the 1.9 so it is obviously the one to go for.

Thats good to know-thanks.