* Sees FY oper. margin "at upper end" of 8-10 pct range
* Aims to hit 1.5 mln sales target in 2013, 2 years early
* Q3 oper. profit down 17 pct, missing low in analyst poll
BERLIN, Nov 4 (Reuters) - German luxury-car maker Audi stuck to its full-year profit target even as higher costs of plants and technology inflicted a double-digit drop in third-quarter earnings.
The Volkswagen-owned division is pushing costly overseas expansion, adding capacity in China, Mexico and Brazil as the brand aims to topple luxury-sales champion BMW by the end of the decade.
Audi's second Chinese factory will start production at the end of the year while the carmaker is spending almost 1 billion euros ($1.35 billion) on a new site in Mexico to build the next generation of the Q5 compact SUV from 2016.
"We're making high upfront expenditures and investments now and in upcoming years in order to create an even stronger global position for Audi," finance chief Axel Strotbek said in the quarterly earnings statement on Monday.
Audi reaffirmed its goal to achieve an operating profit margin "at the upper end" of a target range between 8 percent and 10 percent this year, even as third-quarter operating profit plunged 17 percent to 1.10 billion euros, missing the lowest estimate of 1.13 billion euros in a Reuters poll.
Profit from Audi, which accounts for about 40 percent of VW group operating earnings, funds the parent's drive to surpass General Motors and Toyota as the world's biggest carmaker by 2018.
Daimler's Mercedes-Benz <DAIGn.DE >, which also includes the Smart city-car brand, posted a 23 percent jump in third-quarter earnings before interest and tax (EBIT) to 1.2 billion euros.
However Audi's third-quarter operating margin of 9.4 percent beat the 7.3 percent return on sales at Mercedes.
BMW will report third-quarter figures on Tuesday.
Audi, based in Ingolstadt, Germany, also stood by a goal to hit its sales target of 1.5 million cars and SUVs in 2013, two years early.