This should be without prejudice to the right of Member States to encourage or restrict the use of engines that have already been placed on the market, provided that the criteria applied are not discriminatory and are objectively justified.
Ba cheart nár dhochar é sin do cheart na mBallstát úsáid inneall a spreagadh nó a shrianadh, ar innill iad a cuireadh ar an margadh cheana, ar choinníoll nach mbeidh na critéir a chuirfear i bhfeidhm idirdhealaitheach agus go mbeidh bonn cirt oibiachtúil leis na critéir sin.