Originally Posted by codprawn
.....Sludge in the engine could come from lack of oil changes or using additives like slick 50 etc .....
And a multitude of other reasons such as over fuelling, poor combustion, wrong oil, poor engine breathing, poor engine room conditions, poor environmental conditions, poor engine design, poor manufacturing quality.etc etc .................... to name a few
If you want to know what is causing the sludge get the oil analysed, it is amazing what you will find out
As to Steyr engine, Mermaid are the importer for this engine and are a long established family own firm with a good reputation
I trust their advice because they are proper engineers who know there busness