My SLK350 was trouble free until 1850 miles. Since then the check oil light has come on at least 4 times. Each time it required adding 1-2 quarts . The dealer denied a problem, but I eventually discovered that there are TSBs covering this issue- MB was not forthcoming in admitting a problem. The car is great fun to drive, but I have serious concerns about long- term ownership, reliability and resale value. Lease it, don't buy it.