Sea Foam in oil crankcase – how long should I drive? [SOLVED] Asked by Dan E. In Texas Can I leave Sea Foam in the crankcase longer than 300 miles?
Hi Dan. Yes, you can leave Sea Foam in your oil crankcase for longer than 300 drive miles. We recommend adding 100 to 300 miles before an oil change, partly to make sure the vehicle is driven long enough to allow the treatment to circulate and reliquefy the heavier oil residue. Hope this helps!