TDI is a protected designation of Volkswagen
and means Turbo Direct Injection;
thus in Europe GM has to use the designation
DTI for their engines with e.g. Opel and Vauxhall.
CDI is a protected designation by DaimlerChrysler
and means Commonrail Direct Injection.
The direct means that the diesel oil is directly
injected into the cylinder as opposed to older e.g.
Mercedes which have a pre-chamber.
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