How long can Sea Foam be left in oil? [SOLVED] Asked by Rick J. In Alabama Is there any harm to leave Sea Foam in oil for a long period of time?
Thanks for the question Rick. Though we recommend adding Sea Foam toward the end of the oil interval, it can be left in motor oil for the duration of the interval. It’s made form 100% petroleum and cannot possibly cause harm when mixed with crankcase (or fuel).