Can anyone tell me what CV-Tronic additive refreshment is? it is in the service book and seems specific to the Z 18XE engine in the Vectra C and Signum.

I believe it's for the Automatic gearbox but the handbook mentions it twice under Service Plan G. It mentions it once alone and then again under the Automatic transmission section.

The reaon I'm asking is I'm just about to get it serviced for the first time outside the Vauxhall Stealer network and as my brother in law had a gearbox fail at 80000 miles on his 52 plate 1.8 LS. I don't want to neglect my manual gearbox if there is something my garage should be doing or adding to the gearbox.