Vauxhall VECTRA Owner's Manual page 232

Starting on inclines
Vehicles with ma nual transmission:
The m ost favourable engine sp eed when
starting off on an incline is b etween 2500
and 3000 rpm for p etrol engines a nd
between 2000 and 2200 rpm for diesel
engines. Hold engine rpm c onstant,
enga ge c lutch grad ually (let slip), release
brake and open throttle. If possib le, the
engine sp eed should not drop d uring this
proced ure.
230
In vehicles with autom atic transmission 3
or CVTronic 3 , use full throttle.
Before starting off under extreme
conditions (high c om bination w eight,
mountainous terrain with steep inc lines),
switch off all unnecessary elec trica l loa ds
(e.g. heated rear wind ow , air conditioning
sy stem 3, heated seats 3).