My engines running great! Why not add an additive smile

Seriously though, my main seal seems to be leaking a wee bit. Also my seals in my 3 speed transmission are questionable. Would an oil stabilizer / leakstop combo like Lucas oil stabilizer be an OK idea in my engine and transmission?

1955 235 engine. 3 speed manual "peanut" Transmission.

Last edited by windyville1; 10/07/2017 6:54 PM.
1950 SUBURBAN / SCHOOL BUS A.K.A "THE SCHOOL RUST"