On July 20th 2017, Original Equipment Manufacturers (OEMs) from North America and Asia concerned with delays in the finalization of the next generation ILSAC GF-6 (Gas Formulation #6) specification, sent a letter to the industry requesting an interim specification coined "GF-5 Plus" to deal immediately with potential field issues.
The development of ILSAC GF-6 (and its sister category API SP) is by far the most challenging category to be developed for Passenger Car Motor Oil (PCMO). It involves the development and validation of a record 6 tests (4 replacement and 2 new) proposed to be included in the specification. The relevant industry bodies have been working on this specification since 2013. The development of the engine tests has encountered obstacles causing delays.