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BMW's newest TwinPower Turbo engine oil is LL14 FE+ certified. It meets BMW's standards for LongLife 2014 ("LL14") and improved fuel economy ("FE+"). In testing, BMW saw a 3% improvement in fuel economy over the LL01 5W30 in the N20 4-cylinder. The new 0W20 replaces the previous 5W30 oil used in some 4-cylinder and 6-cylinder BMW models and is the standard oil for the new B-series modular engines (B46, B48, B58). As of December 2015, BMW has not backdated the 0W20 for any other engines.