Red Giant Locomotive Engine Oil 20W-40 G7 is a multi-grade, 11 TBN, LMOA Generation 7 level engine oil and was developed to meet the demands of modern railroad, stationary power generation, and marine heavy-duty diesel engines. It is an ashless-dispersant, non-zinc, non-chlorinated oil and is approved by Progress Rail (formerly EMD) and Wabtec (formerly GE).