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Poor quality EALs can decompose to form a black sludge.

Poor quality EALs can decompose to form a black sludge.

https://www.mpropulsion.com/news/view,why-are-stern-tube-bearings-failing_53811.htm   Marine Propulsion Dutch stern tube maintenance specialist RM propulsion has no doubt what the cause of many stern tube bearing problems is: low quality biodegradable...