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Benzene is a big no no here in the US, the EPA won't allow it. I suspect that is the case in the UK too. Generally, the additives in unleaded are metallo-phosphates and are more volatile at the temps that the internal parts reach, so don't form deposits. Most deposits will come from the oil. Synthetic oils from fewer deposits, as they are more chemically and thermally stable.
My plugs ran cleaner with the advent of unleaded.
Oh, the seats in alloy heads aren't cast iron, but austenitic steel.
[ This message was edited by: Mecchanica on 2007-02-27 15:48 ]
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