On Sun, 25 Dec 2011 15:29:54 -0500, Tony Miklos
wrote:

On 12/25/2011 1:21 PM, wrote:
Lead has been removed from gasoline and the choke has been eliminated
by the use of EFI and electronic engine controls in general.. This
accounts for the vast majority of the improvement in engine
reliability and life.

I never knew lead was in any way harmful to engines? What negative
affects did it have?

It contaminated the oil, fouled the plugs, built up inside the engine,
polluted the air causing health problems.