Quote:
Originally Posted by Craig
I have the upgraded relay installed in my 82 300D, it does seem to help with cold running and reduce the smoke when it's cold. I also suspect it causes the glow plugs to burn out sooner due to the extended use, but I've been happy with mine for several years. I would just buy the kit with the 4 GPs and keep them as spares, sooner or later you will need them anyway.
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Be careful, the G/Ps that come with the kit are to replace the old type filiment G/Ps and are 18mm, i think later cars the G/Ps are 14mm thread.