Dr Bert has chosen to maximize cooling (even when it's NOT needed) not by eliminating the thermostat structure, but by removing the temperature sensor and thermostatic action - VERY different from running without a thermostat (even one that been eviserated) in place.

What he has done will increase the time it takes the engine to reach optimal opearting temperature. With a thermostat hanging open (rather akin to what he's done), most of my OM60x engines will never even reach 65-70 deg. C in temperate weather (may not reach 55 deg. C. in COLD weather) and the cost is seriously increased wear, slow boiling off of water and volatile accumulates in the oil and considerably lower fuel economy. When temps reach zero (F) the output from the heater isn't really even teped and at 20 below it becomes darned cold (and the engien does NOT run well and even the coolant operated fuel hear doen't do it's job.

As to his suggestion about reducing combustion/exhaust temperatures, that's what an EGR does and BOY does that increase engine wear and lower turbo boost. Boost pressure is absolutely correlated with exhaust temp. There may a a really good reason to run some engines without a thermostat, but I haven't seen one on this forum.

A thermostat is a device that is designed to PREVENT cooling until the engine reaches it's intended operating range. Then it should become invisible - allowing maximal cooling. The Mercedes design does that perfectly when the system is in good working order and is properly maintained.

Marshall