In 2000-2011 refuelling was allowed during race weekend sessions for the entire weekend. All DTM cars carry a Bosch-provided electronic control unit (newly upgraded Motronic MS 7.4 model). Live telemetry is used only for television broadcasts, but the data can be recorded from the ECU to the computer if the car is in the garage and not on the track. The power box management of all DTM cars are utilizing Bosch PBX 190. The battery of all DTM cars are supplied by Braille B128L Micro-Lite lithium racing battery since 2012 season. Side rear-view mirrors for all DTM cars are fully mandated to easily viewing opponents behind. The cars were powered by traditional classic naturally-aspirated (no turbocharger or supercharger) indirect-injected with four-stroke Otto cycle unleaded petrol-burning stock block V8 engines, with aluminium alloy blocks, DOHC valvetrain actuating four-valves per cylinder and limited to displacement since the series' resumption in 2000. These first-generation DTM car engines produced about power output at 8,500 rpm in 2000-2016 and later slightly increased to over in 2017-2018 as a result of intake air restrictor slight increase from . Audi, BMW and Mercedes-Benz provided DTM engines with the manufacturers and models respectively (Audi has provided TT DTM later A4 DTM later A5 DTM and later RS5 DTM through its tuning partner Neil Brown Engineering in 2002 until 2018 while BMW has provided M3 DTM and later M4 DTM and also Mercedes-Benz has provided CLK DTM later C-Class Series and later C-Class Coupé). Opel were provided DTM V8 engines for Opel Astra Coupe DTM and Vectra GTS V8 DTM cars through its tuning partner Spiess Engineering in 2000-2005. The engines were prototyped race custom-built similar to 2006-2013 Formula One engines, 1997-2011 IndyCar Series engines and other naturally-aspirated V8 racing engines. The bore width and stroke height of first-generation DTM naturally-aspirated V8 engines were . DTM naturally-aspirated V8 engines were rev-limited to 9,000 rpm. The valve train was a dual overhead camshaft configuration with four valves per cylinder. The crankshaft was made of alloy steel, with five main bearing caps. The pistons were forged aluminium alloy, while the connecting rods are machined alloy steel.