The CXO300 diesel outboard is approved for twin installations on Lake Constance, bordered by Germany, Switzerland and Austria
The Cox Marine, CXO300 engine has won a landmark emission approval for twin installation operation on highly-regulated Lake Constance, central Europe.

Clean-burning 300hp Cox Marine diesel engine now offers most powerful outboard solution available on picturesque lake after achieving new Bodensee BSO-II certification.
Cox Marine has announced that its CXO300 high-powered diesel outboard engine has surpassed the stringent BSO-II Bodensee emission standard for twin installations operating on Lake Constance.
Achieved in collaboration with Swedish and German distributor Diesel Power AB, the landmark certification introduces the most powerful, high torque outboard solution available on the lake and demonstrates that the ground-breaking 300hp CXO300 is a clean-burning engine designed to meet evolving emissions regulations across the world.
The new Lake Constance approval for CXO300 twin installations is a rare exception to the standard rule allowing only a single gasoline outboard up to 100hp to operate on the protected water.
Bordered by Germany, Switzerland and Austria, the picturesque Lake Constance is regulated by the Lake Constance Shipping Regulations who work towards safeguarding its natural environment, granting special rights to passenger ships and fishing boats to operate on its waters. The 63km lake is known for its tranquillity and beauty, and is also a popular destination for motorboating and sailing, along with other water sporting activities.
The CXO300 produces 20-35% less CO2 emissions than comparable gasoline outboards, contributing to Lake Constance upholding its regulations to protect its natural environment. Strict emissions standards for the lake, reaching beyond the general levels applicable for the European Union, required the 300hp CXO300 to prove an emission index no greater than 58. To gain the twin installation BSO-II certificate, the CXO300 registered an emission index of 54.34, calculated using four parameters of CO, NOx, HC and PN.
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