I have a set of both in the my 617 turbos.


The BOSCH nozzles have a small pintile passage that can get clogged, especially with WVO use. They are louder and run rougher.

The MONARK nozzles dont have small passages to get clogged. They are noticeably quieter and smoother running.

Fuel mileage are unoticeably similar.

I dont have bosio experience.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car