Vectras and Cavaliers are funny things....i loved the old Cavs as well, had an ancient Ascona (Opels Cavalier) 1.6 SR and it was long in the tooth but cant remember how many miles, never let me down.
Had a 1.6 petrol Cavalier 1992, again, a really good simple, reliable car.
!.8 Vectra SRI, 2001...loved that but it got a tap in the engine at 88K plus management lights intermittently so i suspect that one probably didnt last long after i traded it in.
My son had the Vectra C 1.9 SRI CDTI estate...jeez that could shift...it'd done way over 100K, maybe 140K but it had to have a new DMF on it at considerable expense. Still looked clean when he sold it though.