Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
Yearly for me, just do it as part of the rest of the normal service!
My gearbox oil was black when it was changed when I got the car, was still golden the 2nd time. My engine oil was black after a year!
Easily repairable. Cut out the rust with a grinder until you get good metal. Coat everywhere else in rust preventative and then weld in a new panel.
It's not exactly an intricate area