wrong petrol

[andi6139]

would LRP do any damage to unleaded car

[Auto-tecnica]

Certainly not if you have only put it in by mistake and don't plan to run the engine on it for a long period of time.

The issues are: contaminating the catalytic converter with additives in LRP, and incorrect ignition timing due to the slower detonation properties of LRP. This will not be a problem with a modern engine management system as the ignition point is controlled electronically.

I wouldn't be surprised if the engine actually ran better on it.