You can leave Sea Foam Motor Treatment in there for the life of the oil (until your next oil change). It won’t hurt anything to leave it in for a long period of time.
That said, we recommend adding Sea Foam to your oil about 100-300 miles before your next oil change. That gives it time to clean and allows the residues that the Sea Foam cleaned to be drained away with the old oil.
You can leave Sea Foam Motor Treatment in there for the life of the oil (until your next oil change). It won’t hurt anything to leave it in for a long period of time.
That said, we recommend adding Sea Foam to your oil about 100-300 miles before your next oil change. That gives it time to clean and allows the residues that the Sea Foam cleaned to be drained away with the old oil.