All Vectras before 2002 ARE in the affected range! I rang Vauxhall Luton Tech Centre twice and dealt with my local dealer 3 times on this subject and they ALL came back with the same answer....Its not in the affected range!
I chose to ignore this information because i'm a stubborn b4stard and upon removal of the cam chain cover we discovered the old style oil jet!
My advice to anyone is get your chain done if you have a Vectra pre 2002 with no paperwork to verify the replaced chain and jet. It WILL have the old style jet in it and you WILL be sorry when it snaps! You can get the cam chain parts for just over £100 and Daz or Benny can arrange a time to do it for far less cost than Vauxhall. I believe Vauxhall charge around £600 to do the cam chain and around £1200 if your chain snaps and they have to replace things.
Its really up to you...as harsh as it sounds!!
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