I drained it last week,if my memory is right,it has a 14 mm head(about 99% certain).I think it is 10mm screw,don't know the threads,and I could be wrong on the 10mm.Luck,Charlie
AutoForums.com is the premier network of enthusiast-owned
enthusiast-operated automotive communities.
We operate more than 100 automotive forums where our users consult peers for shopping information and advice, and share
experiences and opinions as a community.