Installing screw:

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Cleaning Thread With Degreaser

Courtesy of VOLVO CARS OF NORTH AMERICA.

Clean thread with degreaser before installing the bolt.

Install:

thread seal (PN 1161370-0) on the screw
the stud in its place. Tightening torque 25 Nm (18.5 ft. lbs.).
vibration damper. Tightening torque 25 Nm (18.5 ft. lbs.).

Add approximately 0.75 liters (25 oz) of oil (P/N. 1161513-5).

Install:

the level plug. Use a new washer (P/N 11998-2). Tightening torque 35 Nm (26 ft. lbs.).