I am looking for a replacement for the preglow relay on my 1979 240d.
The catalog from Professional auto parts, listed the preglow relay,
silver colored, just as mine is, for the 616.912 engine at $114.
above it, was another one, which stated that it superceded the previous
one. This one was black and included 4 glow plugs, pencil type (looked
like pencil). For $91.
Obviously, I would like to replace the relay and get 4 glow plugs for a
Does my 1979 ( made in 10/78) have the loop type or the pencil type
How can I determine which one I need?
Are they interchangeable?
Can I use this newer preglow relay?