Mobil Diol 40

DIOL™ series oils are premium heavy-duty crankcase lubricants for locomotive diesel engines. These products were developed to meet the stringent performance requirements of Tier 4 locomotives from Progress Rail (EMD engines) and GE Transportation. Older locomotive engines will also benefit from using the DIOL series. The additive system provides excellent engine protection, enhanced oxidation performance, improved oil consumption control, enhanced Alkalinity / TBN retention, and oil drain interval extension capability compared with LMOA generation 6 oils such as our former Diol 9 RD series.