Leaded Fuel and Lambda Sensors

[RABBITT_Andrew at mv8.orbeng.com.au]

>Problem here is in OZ you can still get high octane leaded at the 
>pump, whereas the same octane rating unleaded is unattainable.

PULP in Australia is (from memory) 96 octane, whereas leaded has been 
reduced to 95, therefore you should be able to run with PULP, at 
least for tuning with an O2 sensor

>Unless they had hardened alloy valve seats, a car built for leaded 
>(up to 1985-ish) just cannot run on unleaded.

Valve seat recession is a long term problem, and it certainly doesn't 
preclude the use of ULP in pre-ULP engines.  It depends on what you 
want to acheive.