Hyundai Santa Fe 2013: Diesel servicing advice

I am getting conflicting information from service mechanics. A 2013 Hyundai Santa Fe Elite auto diesel with 30,000km is coming up for sale. It has been leased and I can buy for the residual price. My local mechanic who has been servicing my Corolla Seca for 10 years tells me Hyundais are very expensive to service and repair and diesels especially, and will need to be serviced often as I do short trips. Basically he hasn't one good thing to say about the Hyundai and tells me to buy anything except one.