IF it still has the original (OEM) oil cap, then the specs for oil will be printed on it.
Tyre_pressures_for_Vauxhall_vectra_SRI_120_CDTI_1.9_tyre_are_215_50_F17_91W
The grade is 66.25%
Tales of a Fourth Grade Nothing has 120 pages.
75%
Behind the camshaft vernier wheel on the Z19DT 120 engine
As a percentage it is 80%
The bottom line is no they are under powered Even the Sri 140 is a bit sluggish
90% or A-
120
75% or C
72% is usually a C minus.
It is 65%. What that is in terms of grades will depend on where the grade boundaries are set.