Xpander is engineered in Indonesia where gasoline is cheaper than diesel. Short answer, not anytime soon. Not worth the R&D.
If Xpander is already close to Innova in price, fitting a diesel will probably match or exceed it. MMC has little room for margins since it's much smaller company lacking economies of scale.
Toyota on the other hand have the capacity with 2.4 and 2.8 GD-series engine and 6spd transmission all being used by Innova, Hilux, Fortuner, HiAce, Prado.



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