A coolant leak may develop after oil filter replacement. When tightening or loosening the oil filter the filter housing may turn damaging the coolant o-ring seal. The recommended procedure is to hold the filter housing when tightening or loosening the oil filter.
Car Problem Reports
Volkswagen Cabrio Coolant Leak From Oil Filter Housing O-Ring
Volkswagen Cabrio Problem
Engine Affected: 2.0L 4 Cylinder
Average Mileage: 148,333 mi (135,000 mi - 160,000 mi)
Visitor, 2001 Volkswagen Cabrio, 2.0L 4 Cylinder, 135,000 mi
Slow coolant leak for the past year then my oil filter housing unit cracked leaking oil. Ordered a used oil filter housing & waiting for it to arrive