Originally Posted by nwboater
Adapting the modern auto turbo diesel for marine use makes good sense. Our "other boat" is a 24 foot 2014 Mercedes Benz Sprinter motorhome by Leisure Travel. It's powered by a V6 turbo diesel that runs quiet, smooth, and delivers up to 19 gph. The entire power plant is small and light weight compared to the Lehman 6N-140 in my Willard trawler. Probably not practical for heavy displacement hull boats, but seems ideal for the light weight commercial use vessels. I wonder how price compares to conventional OB...double the price?
I believe the merc i/o 120hp with the vw car engine was a total disaster. Surprisingly the toyota land cruiser engine has also had major problems in marine guise, as has the yanmar BMW engines.
Continuous duty in a boat doesn't seem to treat car engines kindly, they seem to like light duty cycles on low load.think how hard it is to design a bullet proof marine engine from scratch.
Of course they could be lucky with their gm diesel car engine.
I think your price guess is probably spot on.