To some extent it all depends what oil it came filled with. In the UK current Hyundai/Kia diesels are filled with long life fully synthetic C3 grade oil and require an oil change every 20,000 miles or 2 years.

Your service book will tell you what the requirements are. But if you have missed an oil change you will have lost your warranty.

I have done 17200km in 20 months, mixed use , where we live is a bit out of the way and even supermarkets involve a return journey of 30+km, some even twice that.

The handbook does say first service at 30000km. I just thought the oil looked very black, I'll contact the dealer to check.

Thank you all for your replies, much appreciated.

Certain vehicles (Vauxhall Corsa is one) come from the factory with a special oil to aid engine break in. I would personally check that the Hyundai isn't one of these and if so stick to the schedule. Otherwise 7 -10,000 miles /12 months at the absolute max. Anything longer is risking premature engine wear and/or turbo EGR problems.

Remember modern oils are very advanced but they still have to carry similar amounts of combustion acids, soot, metal particles etc. that build up over time to destroy your engine.

Same goes for synthetic gear oils - 60k is enough for long life.

Many cars suffer EGR problems and turbo problems and the root cause is owners foillowing the factory oil change intervals . Renault's 14,000 intervals on the early Megane DCI were ridiculous for Uk conditions with lots of short journeys as many owners found to their cost.