Quote:
Originally Posted by jamesqf
Strange, then, that so many older cars seem to be able to run just fine on unleaded gas, and some have been doing so for hundreds of thousands of miles. When's this mysterious sinking valve problem supposed to show up?
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Just depends on the quality / softness of the valves and valve seats used.
Some manufacturers used quality hardened items, and didn't have issues.
Some still use rubbish to this very day, so their cars end up on the LPG-conversion blacklists.
When I found out that Japan had already phased out lead fuel additives by the time my first
hand-me-down car was built, I started feeding it ever more unleaded fuel - which was cheaper than leaded fuel to help its introduction.
Ultimately, it ran almost exclusively on unleaded.
Rust and electric issues got it in the end ... not the valves
As some might argue, lead wasn't originally in gasoline - it was added from the 1920s on to cure what was and is essentially a manufacturing issue.