Formula 1 manufacturers will no longer be able to provide customers year-old power units after the FIA confirmed the 2016 F1 Sporting Regulations.
Red Bull and Toro Rosso are still without an engine supplier for next year, but reports suggested Ferrari offered them 2015-specification units for the 2016 campaign. However, the powers that be at Red Bull are adamant that they are only interested in accepting engines that are of the same standard as works teams.
Under current regulations engine suppliers are able to provide their customers with older spec engines with Manor Marussia using a 2014 Ferrari power unit this season.
That, though, won't be allowed next year as the FIA F1 Sporting Regulations state all engines must be the same specification as the unit homologated on February 28, 2016.
Article 23.5 reads: "Only power units which are identical to the power unit that has been homologated by the FIA in accordance with Appendix 4 of these regulations may be used at an Event during the 2016- 2020 Championship seasons."
Works teams, though, can still get an advantage over their customer outfits when it comes to software mapping and fuel products of their power units while teams could still make further tweaks to the new engine rules at Thursday's meeting.
However, regulations state that "unanimous agreement of all competitors entered in the 2016 Championship" are needed to make any changes.