Begrundelsen for at blande PME (og SME) med RME er, at PME og SME har et højere koldfilterpunkt end RME og derfor ikke egner sig til anvendelse i den rene form i vintermånederne i de kolde egne af Den Europæiske Union.
The reason for blending PME (and SME) with RME is that PME and SME have a higher Cold Filter Plugging Point (CFPP) than RME and are not therefore suitable for use in their pure form during winter months in cold regions of the European Union.