If you've spent any time in classic car forums, you've seen the debate: someone posts a photo of a bottle of octane booster in their glovebox next to a paper road map, and the comments split into two camps immediately. One side swears by it. The other says it's snake oil for a problem that doesn't exist anymore. The truth, as usual, sits in the middle — and it depends entirely on what's under your bonnet. We're going to lay out exactly who benefits from carrying a bottle of O

Fuel isn't one-size-fits-all. A modern race engine and a 1965 straight-six Healey want completely different things from the liquid in their tank — and picking the wrong one can cost you power, or your engine. Here's how the two categories differ, and how OlioClassico approaches each. What racing fuel is for: Racing fuel exists to let an engine run harder than pump fuel allows. Motorsport engines run high compression ratios, aggressive ignition timing, and sustained high RPM —