All-wheel drive vehicles
Loosen the screw from the inspection hole and check the oil level. The inspection hole is located on the right side of the transfer case housing.
The oil level should reach the bottom edge of the hole.
If necessary, add oil by cutting the tape securing the ventilation hose to the wiring harness and disconnecting the hose.
Using a small funnel, pour oil through the ventilation hose.
Source is on the website OPELBOOK
After topping up, wait about 3 minutes and check the oil level again.
Caution: Do not add too much oil at one time (its level is going down slowly).
Connect and secure the ventilation hose to the wiring harness.
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