Maruti Suzuki India Ltd.'s market cap is ~ Rs. 50, 000 Cr.'s ($ 10 Billion)
, who would have thought!
Tata Motors Rs. 150, 000 Cr.'s ( $ 20 Billion), Mahindra & Mahindra Rs. 55, 000 Cr.'s ( > $ 11 Billion), Eicher Rs. 12, 000 Cr.'s ( $ 2.5 Billion), Ashok Leyland cap Rs 3, 560 Cr.'s (> $ 1 Billion), Another Co. I forget Oh Maybe Escorts Tractors Rs. 4150 Cr.'s ( < $ 1 Billion).
Hero MotoCorp. Rs. 40, 000 Cr.'s ( $ 7.5 Billion), Bajaj Rs. 3, 780 Cr.'s ( $ 7.5 Billion), TVS Rs. Cr.'s ( $ 7.5 Billion), smaller players like Sonalika, AMW, Tatra, HM and the giant MNC's like Hyundai, JCB, GM, Ford etc. all put together is easily $ 100 Billion plus. This just the OEM's.
There's govt. types like BEML, Scooter's India Ltd., Defence Vehicles from Ordinance Factory Board etc. Then the new electric 2 wheeler makers. Throw in another $ 100 Billion for non OEM's, parts makers. Exports, sales, servicing, machining, re-cylcing, denting & painting.
Indian auto biz is big. In PPP terms I'd put it closer to $ Trillion considering steel is local to India.