Auto shares were trading in the red in Tuesday's session.Shares of Bharat Forge (down 4.8%), Apollo Tyres (down 3.01%), Eicher Motors (down 2.6%), Maruti Suzuki (down 2.42%), IUS Motor Company (down 2.4%), Tata Motors (down 2.26%), Ashok Leyland (down 2.26%), Mahindra & Mahindra (down 2.15%), Bosch (down 1.52%), MRF (down 1.26%), Hero MotoCorp (down 0.94%) and Exide Industries (down 0.74%) were the top losers in the index.The Nifty Auto index was trading 1.86% down at 5574.0 around 11:52AM. Benchmark NSE Nify 50 index was down 178.75 points at 9060.45, while the BSE Sensex was down 661.7 points at 30899.52.Among the 50 stocks in the Nifty index, 13 were in the green, while 37 were in the red.shares of Vodafone Idea, Tata Motors, Vedata, ICICI Bank, SBI, BHEL, RBL Bank Ltd., Motherson sumi ,RIL and Axis Bank were among the traded shares on the NSE.