The FIA has confirmed a mid-season rule change following Formula 1's ongoing engine dispute . A new test will be introduced from June to close a loophole. The new F1 season kicks off in Melbourne next weekend, and the build-up has seen controversy as rival teams claimed Mercedes had f ound a way around engine compression ratio limits . The compression ratio limit has been reduced from 18.0 under the previous ruleset to 16.0 as part of F1's biggest regulation changes ever. At present,