a high solvency dispersive power crude oil is added to a blend of incompatible and / or near - incompatible oils to proactively address the potential for fouling heat exchange equipment . the hsdp component dissolves asphaltene precipitates and maintains suspension of inorganic particulates before coking affects heat exchange surfaces . hsdp co - blending for fouling mitigation and on - line cleaning can be affected using different concentrations of top - performing and moderate - performing hsdp crude oils .