Adding Sea Foam to crankcase – how long before changing oil? [SOLVED] Asked by Lance P. In Missouri How long do you drive or leave a truck idling after adding Sea Foam and before changing the oil?
Thanks for the question, Lance. For best results, we recommend driving at least 100 odometer miles with Sea Foam in the oil. Can instructions show to add at least 100 to 300 miles before each oil change interval.