what we do. C.C.JENSEN - the global leader in oil maintenance with more than 60 years of experiences - designs and manufactures CJC ® Oil Filtration solutions for removal of particles, water, acidity and oil degradation products (varnish) from hydraulic oils, lube oils, gear oils, diesel fuels etc.. Our CJC ® Filter Inserts are made of 100% natural cellulose fibres from sustainable resources