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Open the fuel filler door. If it says "diesel fuel only" inside, it is a TDI; if it says "unleaded fuel only" it cannot be a TDI because TDI is a diesel engine. As to telling if it's a GTI...all GTIs I know of have thin red accent stripes, but if you got yours used it's possible the previous owner removed all signs of your car's GTIness.

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9y ago

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