While many W251 units have been decommissioned over the years, there are still quite a few in service worldwide. Ten years ago ARNOLD installed the first Single Layer Insulation System on a W251 with great success.
Just recently we developed, manufactured and installed a state-of-the-art redesign on this engine and the result is quite impressive. At ARNOLD, we don't ignore legacy units, we embrace them and keep them running at peak performance with these guarantees:
Highest possible thermal performance
Easiest, quickest, and safest maintenance access possible