Oil Filter canister on 2008 Volkswagen Jetta

On the bottom of the oil filter canister is a plastic screw cap. When you unscrew the cap,nothing comes out. What is it for?

by in Lagrange, IN on April 11, 2009
1 answer
ANSWER by on April 11, 2009
This works in conjunction with a special tool to pre drain the filter housing prior to removal. N o mess that way....