Oldsmobile cutlass supreme 1996 Owner's Manual page 255

It is recommended that the upper limit not exceed plus
0.4 degrees from the center of the bubble. Other drivers
may flash their high beams at you if your adjustment is
much above plus 0.4 degrees.
If you find that the headlamp aiming needs adjustment,
follow these steps:
Start with the horizontal aim. Don't try to adjust the
vertical aim first.
1. Check the horizontal aim indicator. The pointer
should be lined up with 0 (zero).
I
2. If the pointer isn't at
0 (zero), turn the
horizontal aiming
screw to adjust the aim.
3. Check the vertical aim indicator. The bubble should
be centered on 0 (zero).
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