The basic design is based on the Mahindra Armada Grand. The first-generation Bolero was equipped with a Peugeot 2. 5 L (150 in3) IDI engine which produced 75 bhp (56 kW).  The second generation was released with slightly modified exteriors (a larger grille being the most obvious change) and the major change was the engine, a 2. 5 L (150 in3) in-house engine from Mahindra. It is powered by a 72 bhp (54 kW) 2,523 cc (154. 0 cu in) turbo-charged direct injection diesel engine. In September 2011, the third generation Bolero was released, with a more thoroughly re-designed front with jewelled headlamps. In India it is powered by the 63 bhp (47 kW) M2DiCR diesel engine with a "soft turbo", mated to a five-speed transmission. This latest engine meets the Bharat IV emissions standards.