As its a Vivaro I'd guess it's the Renault DCi POS? Have heard of that being am issue in the Insignia, strange it didn't effect the rest of the range, or at least I never heard of it.Out of curiosity, what's the issue with it? Might help with a recommendation. We had a couple of guys in work with Insignias with presumably the same engine and they all gave oil pressure issues. There's a seal on the pickup tube that goes hard and lets air past, thus less vacuum to lift oil from the sump. If it's early, it might be saveable with a new seal.