What corrective action should be taken if the oil filter is found to be extremely dirty during replacement?

The correct corrective action in this scenario is to treat the oil tank for sludge by adding additives. When an oil filter is found to be extremely dirty, it typically indicates that the oil system is contaminated with sludge, dirt, or other impurities. By using additives specifically designed to break down or suspend sludge in the oil, the quality of the oil can be improved, potentially preventing further clogging of filters and other components in the heating system.

Treating the oil tank with additives can help maintain the overall health of the oil system and enhance the efficiency of the burner. This proactive measure addresses the underlying issue rather than merely replacing components without resolving the root cause. It is essential to ensure that the heating system operates efficiently and to extend the lifespan of components by keeping the oil clean.

While other actions such as replacing the burner or flushing the entire system may seem like potential solutions to a dirty oil filter, they would not directly address the contamination or improve oil quality as effectively as using the appropriate additives. Ignoring the problem could lead to more significant issues down the line, such as increased maintenance costs and reduced heating performance.