Dual-fuel engines that operate over the hot part of the WHTC test-cycle with an average gas ratio that does not exceed 10 per cent (GERWHTC ≤ 10 %) and that do not have a diesel mode are prohibited.
Keelatud on sellised segakütuselised mootorid, mille gaaskütuse keskmine suhtarv WHTC-kuumkäivitusega katsetsüklis ei ületa 10 % (GERWHTC ≤ 10 %) ning millel ei ole diislirežiimi.