unleaded fuel in non catalytic engines

[petroscf]

I think that almost all of us have used or mainly use unleaded fuel for our cars.
Which is the most practical at the moment as I suppose that as in Athens, in your cities as well the old leaded (actually not leaded: LRP, with the special additive) fuel gets more and more rare if not totally stopped!!
In my neighbourhood, only one out of 5-6 gas stations around has the LRP and it costs more than the 100 octane unleaded, so if I run on the 100 octane, I do some economy as well!!!

My question here is the following: When the first catalyst cars and the first unleaded fuels saw the light of day in Europe (around 1990, 1991 I think it was?) it was said that a non catalytic engine shouldn't use the unleaded fuel for 2 readons: 1) due to non hardened valves+heads it might cause the wear of engine as lead is working as lubrication for the engine, and also 2) the gases produced are very dangerous for cancers.
Ok, fritz have told me that all BMW engines after 1973 can run on unleaded petrol as the already have hardened valves+heads.

But how about the no 2.) ???

[e21-Mark]

Benzene is a carcinogen so best to avoid inhalation.