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On diesel models, it’s worth keeping in mind that the particulate filter system can cause problems, especially if you accidentally shut it off part-way through its regeneration cycle. The result is contamination of the oil system with fuel, which results in the oil level rising gradually over time. If this is happening, some damage to the engine may already have been done, so it’s worth getting the car checked out.
Diesels need to be given frequent motorway runs in order to ensure they complete this regeneration cycle, which is only triggered at high speed. So if you’re planning to buy a diesel, it’s worth checking the previous owner’s usage and making sure that you’re going to travel on the motorway often enough.
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