 Ford-Cosworth reluctantly provided support to teams wishing to run their older-spec engines in the IRL, a major point of contention for CART management, to whom Ford-Cosworth was an official engine supplier.The Ilmor Mercedes V-8 engine, also a mainstay CART powerplant, was permitted, but the only time it was used as a one-off at the 1996 Indy 500 by Galles Racing.Starting in 1997, IRL cars were powered by 4.0-litre V8, four-stroke piston, Otto cycle methanol-burning, production prototype-based, normally-aspirated engines and electronic indirect multi-point port fuel injection, produced by Oldsmobile (under the Aurora label) and Nissan (badged as Infiniti).