Why 85 Octane Fuel Could Be Destroying Your Modern Engine

Using the wrong octane rating can lead to severe engine damage and void your vehicle warranty. This video explains why 85 octane fuel, once suitable for older carbureted engines, is now a risk for modern cars with electronic fuel injection and ignition timing.

Octane ratings indicate a fuel's resistance to knock, a damaging phenomenon where fuel ignites prematurely. While 85 octane fuel remains available in certain high-elevation states due to historical compatibility with older carbureted vehicles, modern engines are not designed to handle it.

The video explores the relationship between elevation and octane requirements, detailing why modern electronic systems cannot compensate for the lower rating. Using fuel below your vehicle's specified requirement—typically 87 or 91 octane—can cause internal engine failure and potentially invalidate your manufacturer's warranty.

Source: Never Use This Gas In Your Car!