Mirad test de acidez:
http://gsf.es/attachments/article/50/neutralizadores%20de%20%C3%A1cidos%20para%20aceites%20frigor%C3%ADficos%20minerales,alkylbenzenos,polyol-%C3%A9stres.TESTOIL-MAS.TESTOIL-POE.TESTOIL-MP.pdf
http://www.carly-sa.es/fam-es67-testoil-mp-tests-de-acidez-para-aceites-frigorificos.html
http://www.salvadorescoda.com/tecnico/Ma/tec%20HF18025-028_Checkmate-Det-Contaminacion.pdf
http://www.salvadorescoda.com/tecnico/Ma/tec%20HF18006_AcidTest.pdf
