** India's Nifty Auto index .NIFTYAUTO climb 1.3% this week, only major sectoral index in the green
** Fifteen-member index set for fourth straight week of gains and its longest weekly winning run in nearly a year
** Tata Motors TAMO.NS jumps most, rising 7.9% after UK announces trade deals with India, U.S.
** TAMO owns British luxury carmaker JLR, which gets 1/4th sales from U.S. and accounts for 2/3rd of co's revenue
** Mahindra & Mahindra MAHM.NS climbs 2% after upbeat results, sales forecast
** Auto parts makers Bharat Forge BFRG.NS, Samvardhana Motherson SAMD.NS gain 5% and 3.6%
** Most stocks on index rated "buy" on avg - data compiled by LSEG
** Index down about 1% so far this year, compared to blue-chip Nifty 50's .NSEI 1.5% gain
(Reporting by Nandan Mandayam in Bengaluru)
((Nandan.Mandayam@thomsonreuters.com; Mobile: +91 9591011727;))