Replace the Oil Pan: Cleaning
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Clean the gasket surfaces on the oil pan and cylinder block. Use a razor blade or a gasket scraper and gasket solvent 1161440 .
WARNING:
Use a fume hood or extractor when using gasket solvent.