GM's European division has fine tuned several engines in the Opel / Vauxhall Insignia range (known as the Buick Regal in the States0 for better economy and lower CO2 emissions. Aside from the changes made on the 2.0-liter Turbo unit that yield close to five per cent drop in emissions, all 2.0-liter diesel powerplants including the ecoFLEX models benefit from improvements that make them greener and less costly to run.
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