Should I use leaded, or unleaded petrol in an old Ford Puma 1.7 car? T reg

Should I use leaded, or unleaded petrol in an old Ford Puma 1.7 car? T reg

Unleaded.
Almost anything after 1990 (G/H-Reg) can run on unleaded without modification, and almost everything from about 1993 (K/L-Reg) requires unleaded. Leaded fuel will contaminate the car's catalytic converter.
Most older cars will now have been adjusted to run on unleaded.

Where are you going to get leaded fuel nowadays for it even to be an option? Only source I know is aviation low lead and that's going to be pricey.

Unleaded

All cars manufactured since the mid 1970's are designed to run on unleaded fuel.

Use unleaded. It is easier to find and better for the environment.

The 1679cc Zetec-S (aka Sigma) is an all aluminium engine so has hardened valve seats. It can run ULP.

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