VW TDI's (starting mid 90's) used injectors with 5 hole nozzle tips and 2 stage pop (pilot and main injection) by using 2 sets of springs in the injector.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked