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Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
It's better to put it on the porcelain of the spark plug and the plastic of the coil towers. It's there to keep the plug wires from being difficult to remove. There doesn't need to be any grease on the actual metal contact points.
You don't have to use much, just a small film, not only does it make it easy to put the plug wires on and to take them off, the main reason, it protects connections from moisture and corrosion.