Good question, Paul. First off, add 1 oz of Sea Foam per quart of oil in your crankcase. Most cars and trucks have a capacity between 5-8 quarts, so I’m guessing that a full can would be too much. Do not add more than 1 oz per quart of oil.

Second, I’d recommend adding it 100-300 miles before your next oil change. You can drive it normally during that time. That gives the Sea Foam enough time to circulate and clean. It also lets you drain away all the reliquefied crud (residues and deposits) when you change your oil.

Hope that helps and let me know if there’s anything else!

Thanks for the question, Joe! Yes, you can use Sea Foam Motor Treatment in oil. Sea Foam reliquefies oil residues and deposits so they can be drained away with the old oil. We recommend adding it 100-300 miles before your next oil change. That gives the Sea Foam enough time to circulate and clean. It also lets you drain away all the reliquefied crud (residues and deposits) when you change your oil.

Add 1 oz of Sea Foam per quart of oil in the crankcase. Do not exceed this ratio.

Great question, JC. You can leave it in there until your next regularly scheduled oil change. It won’t hurt anything no matter how long it’s in there.

We typically recommend adding Sea Foam to your oil about 100-300 miles before your oil change. Here’s why we recommend that: Sea Foam works to clean and reliquefy heavier oil deposits. Adding Sea Foam 300 miles before your next oil change gives it enough time to circulate and clean. It also lets you drain away all the reliquefied crud (residues and deposits) when you change your oil.

That said, it won’t hurt anything to leave it in there until your next oil change.

Thanks for the question, Shahid! Here’s the difference:

Sea Foam Motor Treatment:

• How to use it: pour it in your fuel tank or oil crankcase
• What you can use it in: any gas or diesel engine. It’s safe and effective in any kind of gas or diesel fuel, and any kind of motor oil.
• What it does: cleans fuel and oil residues to help your engine run cleaner, run better, and last longer

Sea Foam Spray:

• How to use it: apply it through a gas throttle body or carburetor
• What you can use it in: gas engines only. Particularly useful in gasoline direct injection engines. NOT for use in diesel.
• What it does: Sea Foam Spray is an aerosol version of Sea Foam Motor Treatment. Sea Foam Spray works through a gas engine’s upper air intake to dissolve harmful deposits and residue buildup from intake runners, intake valves, and combustion chamber areas. It’s especially helpful for cleaning intake valves in gasoline direct injection engines (GDI).

In short, both products will clean critical engine areas to help your engine run better and last longer.