Hoping for a bit of help here. Just serviced my '05 TD4 Freelander. After cursing the person who invented the undertray, I removed what I thought was the sump plug but only about 1 litre of oil came out that was much cleaner than the manky engine oil. I then found the correct sump plug and did the service.
What is/was the first sump plug for? If it helps, it was magnetic, unlike the engine plug.