How long can I leave Sea Foam in oil [SOLVED]

Good question, Brian.

The Sea Foam itself is safe to leave in there for the life of the oil. It won’t harm anything and will continue to clean and lubricate. That said, here’s why we recommend adding Sea Foam 100-300 miles before an oil change:

Sea Foam in oil works to reliquefy residues and deposits so they can be drained away with the old oil. It’s a very good cleaner. Adding Sea Foam 100-300 miles before you change the oil does two things:

1. Gives the Sea Foam time to clean.
2. Lets all the liquid crud (the residues and deposits that Sea Foam cleaned and reliquefied) drain away with the old oil. That way the dirty oil is not circulating in the engine for too long.

Check the color of your oil. If it’s dirty, go ahead and change it. If it’s a healthy color, just keep checking it periodically as you normally would and change it when it gets dirty or you reach the recommended oil change mileage.

Hope that helps!

I’m trying to flush sludge from my engine. I want to do a quick flush, I was wondering if it would be safe to add reccomended amount of 5 ounces for 300 miles, then rest of the bottle 30 minutes prior to an oil change? This is my second flush in two months, I used Liquid Molly, but felt that a longer lasting cleaner would be better for remaining residue.

Good question, Lance. Don’t add more than 1 ounce of Sea Foam per quart of oil. Assuming you have a roughly 5 quart system, the 5 ounces added 300 miles before the oil change will be plenty. It may take a few oil change cycles (with Sea Foam added 300 miles before the oil change) to clean out all the sludge. High Mileage Motor Treatment would be a great product for this since it’s made for stubborn/significant sludge and residues.

Also, don’t worry too much about getting it all at once. Just keep at it and things will get better/cleaner each interval. Hope that helps and let me know if you have any other questions!