LupoTDILuke91

I have a 03 lupo 1.4 TDI and only the I is red, where as my friends has on 03 1.4 TDI and his DI is red. What does this mean? From other model VW's I've been told it's to do with the power of the engine but the 1.4 TDI only came as 75 hp.