With the PD engines, one of the 5w-40s via the link above is the best option, or you can go for a 5w-30 507.00 spec oil. They are both 5w, so will give the same cold start protection
http://www.opieoils.co.uk/c-754-vw-50700-oil.aspx
I would not use a 10w-40 in that engine as 10w-40s do not meet the necessary specs. Same applies to most semi-synthetics, they can't deal with the pressure of the PD engines. There are a couple of semis that meet the specs, but they cost the same as the synthetics, so go for one of them.
Cheers
Tim
http://www.opieoils.co.uk/c-754-vw-50700-oil.aspx
I would not use a 10w-40 in that engine as 10w-40s do not meet the necessary specs. Same applies to most semi-synthetics, they can't deal with the pressure of the PD engines. There are a couple of semis that meet the specs, but they cost the same as the synthetics, so go for one of them.
Cheers
Tim