Force is still kicking a 50 year old OM-616 turbo diesel (2.6 liter, 91hp, 250nm torque) mated to a G28 gearbox and made BS-6 compliant. Their current best engine is a 25 year old Mercedes OM-611 (2.2 liter, 140hp, 321nm torque) that was discontinued on Mercedes cars 18 years ago. Force hasn't figured out how to make the 611 BS-6 compliant so the engine isn't even offered on 4th gen Gurkhas anymore. And they'll keep using that G28 gearbox till the earth shatters. Now you can argue that they are doing much better than Tata Desh ka loha that is allergic towards any meaningful in-house engine R&D.