I inherited two cases labelled as Shell engine conditioning oil and carrying the 1961-1971 logo. The cases appear to be full but because of constricted space and a closely fitting table on top of them I can't confirm that cases are sealed and still contain that product. (I don't want to cut open the front of the case to look.) I'm a layman and don't remember hearing about this product before. Is this something that's relatively rare?

Last edited by ShellEnthusiast; Tue Aug 06 2019 08:26 PM.