economical. In theory it only replaced the older Diesel Turbo engine in the range, with the other four-cylinder engines (and the V8 petrol engine) still being available. However, the Tdi's combination of performance and economy meant that it took the vast majority of sales. Exceptions were the British Army and some commercial operators, who continued to buy vehicles with the 2.5-litre naturally aspirated diesel engine (in the army's case, this was because the Tdi was unable to be fitted with a 24 volt generator). Small numbers of V8-engined Defenders were sold to users in countries with low fuel costs or who required as much power as possible (such as in Defenders used as fire engines and ambulances). Along with the 200Tdi engine, the 127's name was changed to the "Land Rover Defender 130". The wheelbase remained the same; the new figure was simply a rounding up. More importantly, 130s were no longer built from "cut-and-shut" 110s, but had dedicated chassis built from scratch. The chassis retained the same basic structure as the 90 and 110 models, but with a longer wheelbase. 1994 saw another development of the Tdi engine, the 300Tdi. Although the 200Tdi had been a big step forward, it had been essentially a reworking of the old turbocharged diesel to accept a direct injection system. In contrast the 300Tdi was virtually new, despite the same capacity, and both the Defender and the Discovery had engines in the same state of tune, , . Throughout the 1990s the vehicle attempted to climb more and more upmarket, while remaining true to its working roots. This trend was epitomised by limited-edition vehicles, such as the SV90 in 1992 with roll-over protection cage, alloy wheels and metallic paint and the 50th anniversary 90 in 1998, equipped with automatic transmission, air conditioning and Range Rover 4.0-litre V8 engine. A new variant was the Defender 110 double cab, featuring a 4x4-style seating area, with an open pick up back. Although prototypes had been built in the Series days, it was not until the late 1990s that this vehicle finally reached production. BMW M52 engine Land Rover South Africa offered a unique Defender during the period the group was owned by BMW. Between 1997 and 2001, the Defender 90 and 110 were offered with a BMW petrol engine alongside the normal Tdi engine. The engine was the BMW M52 2793 cc, straight-six, 24-valve engine as