In December, it emerged that Mercedes had found a possible loophole in the rules that could lead to a performance advantage.

Changes to compression ratio tests will be introduced in the summer after a lot of focus on Mercedes' new power unit over pre ...

Formula 1's governing body, the FIA, has announced a resolution to the sport's regulatory row over engine compression ratios, ...

Toto Wolff has labelled as "utter bulls**t" that the ongoing compression ratio saga means the Mercedes power unit is illegal.

A revised test at 130°C aims to end off-season speculation — but could shift the debate into 2027.

Criticism, confusion, finger-pointing, and the new Formula 1 season has not yet started. After 11 days of testing in ...

Formula One’s governing body has reached a compromise with manufacturers that changes the way the compression ratio will be measured midway through this season and in the 2027 season. New ...

FIA announces updated 2026 regulations, including new engine testing after Mercedes PU scrutiny, plus a series of rule tweaks ahead of the season.

While it won’t take the win out on the Nürburgring, the 2026 Toyota 4Runner TRD Pro instantly makes its case as an off-roading SUV.

The first real controversy of F1's new era. The engine rules set out a compression ratio of 16:1, a measurement of how tightly the pistons squeeze the mixture of fuel and air before it ignites. In ...

Mercedes' rivals succeed in securing a rule change following a pre-season technical row over engine performance.

The FIA has updated the 2026 F1 engine rules, changing how compression ratios are measured to prevent loopholes.