No vehicles need lead or needed it in the past. Your '55 didn't need it either. You were just lead to believe it did by the popular myths that sprang up when the Feds outlawed it in '74.

Everyone used to say the exhaust valves would burn without lead in the fuel to lubricate them.

Well, leaded fuel hasn't been around for use in automobiles for 50 years and I've never seen or heard of a case where that actually happened.

Hi revving, high performance race engines going flat out all the time might experience premature exhaust valve wear without lead but no normal car will.

I've been driving all my vehicles without additives forever with no ill effects.

As I mentioned in another thread, unleaded fuel has been used in automobiles for 100 years. AMOCO invented it in 1923 and it didn't hurt vehicles then and it it won't hurt them now.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)