The EA888 engines built between 2008 and 2011 got a 1.5 mm oil scraper ring instead of a 2 mm one, and the 0.3 mm drain holes in that ring soot up and then block. From there the oil cannot get back to the crankcase, so it reaches the combustion chamber and burns: the reported consumption is one litre every 800 to 1,000 km, which means the oil level warning comes on before the service interval ends. The consumption can start around 60,000 km. In October 2013 Audi issued a separate service bulletin for this (17-13-42) and named the affected range: the 2009 to 2011 A4, the 2010 to 2011 A5 and A5 Cabriolet, and the 2011 Q5 with the 2.0 TFSI engine. The same document states that metro use, meaning frequent stops and long idling, raises the consumption further. In the United States a class action was filed over this and closed with a settlement, after which the franchised dealers repaired cars with the CAEB engine free of charge. The work goes as far as the pistons and costs between 2,000 and 5,000 euro.