Fuel and lubricants are often taken for granted by F1 fans, but it’s a crucial battleground that has a big impact not only on performance, but also reliability.

We hear from Exxonmobil’s Fiona McKewan, whose role as Red Bull technical advisor means she attends races and closely monitors and analyses the various fluids that are essential to the operation of the car and power unit.

She explains the rigorous processes that ensure not only are the products working as intended, but also how the trackside lab can be used to warn of and prevent imminent reliability problems.

Gary Anderson explains why the competitive order will change after F1’s August break despite the focus being on 2026.

And we also tackle listener questions on AI, tyre pollution, attitudes to reliability and containing outwash.

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Inside Red Bull's trackside fuel and lubricants lab - and why it matters