Alternative Propulsion

CXO300 Diesel Outboard Engine Approved for Use on Europe's Lake Constance

Cox 300 diesel outboard, CXO300, diesel outboard

The diesel outboards are among the cleanest burning engines in the marine realm.

The United Kingdom’s 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, the 39.1-mile (63 km)-long central European lake that borders Germany, Austria and Switzerland. 

Achieved in collaboration with Swedish and German distributor Diesel Power AB, the certification demonstrates that the 300-hp CXO300 is a clean-burning engine designed to meet evolving emissions regulations around the world.

Strict Requirements

“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 100-hp to operate on the protected water,” says Cox in a statement.

Lake Constance is regulated by the Lake Constance Shipping Regulations that were established to safeguard the natural environment, granting special rights to passenger ships and fishing boats to operate on its waters. The lake is known for its tranquility and beauty and is a popular destination for motorboating and sailing, along with other water sporting activities.

Lake Constance, strict emissions lake in Germany

Lake Constance is bordered by Germany, Austria and Switzerland and is enjoyed by boaters from all three countries.

Peter Nauwerck, managing director at Diesel Power AB, said, “We are extremely pleased to announce the new CXO300 certification for twin installations, enabling Diesel Power to offer a new and unique eco-friendly outboard propulsion solution to our customers using Lake Constance. It represents a notable exception to the lake’s standard rule — providing boaters with a more powerful system, which quadruples the outboard torque to bring heavier boats on plane.”

The CXO300 is said to produce 20% to 35% less CO2 emissions than comparable gasoline outboards. Strict emissions standards for the lake, reaching beyond the general levels applicable for the European Union, required the 300-hp 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.

Cox diesel outboards, Cox 300 diesels, Cox CXO300 outboards

Twin Cox CXO300s powering across Lake Constance.

“After achieving the BSO-II standard for single installs in 2021 in the first stage of the submission, we are delighted the more stringent twin install has been reviewed and approved by the relevant authorities,” says Hugh Hudleston, head of sales at Cox Powertrain. ”The Lake Constance certification proves the CXO300 is safe to operate in the world’s most protected lakes and regions.”