http://vectra.opel.com/brand_sites/vectra/launch/uk/en/downloads/pdfs/Customerinfo_oil.pdf
The above link is sort of a letter to Opel owners in regards to what oil they should run. The cars have an oil condition dash light and an oil level dash light, and Opel tells them what oil to use as top-up. The say use a GM-LL-A-025 qualified oil, or if that is not available, up to one liter of an A3/B3 oil can be added. They say outright that conventional oils that don't meet at least A3/B3 can do serious damage! No mincing words here.
The above link is sort of a letter to Opel owners in regards to what oil they should run. The cars have an oil condition dash light and an oil level dash light, and Opel tells them what oil to use as top-up. The say use a GM-LL-A-025 qualified oil, or if that is not available, up to one liter of an A3/B3 oil can be added. They say outright that conventional oils that don't meet at least A3/B3 can do serious damage! No mincing words here.