Adding Sea Foam Motor Treatment to your vehicle is a straightforward process, but the method depends on which system you're cleaning. The three main ways are through a vacuum line to clean the engine intake and combustion chambers, into the fuel tank to clean injectors, or into the crankcase to clean sludge before an oil change. Always consult your owner's manual first to avoid damaging sensitive components, especially in modern direct-injection engines.
For cleaning the intake and combustion chambers (the most common "smoke show" method), you'll need about 1/3 to 1/2 of a can. Locate a small vacuum line connected to the intake manifold, like the one for the brake booster or PCV valve. With the engine running, slowly pour the Sea Foam directly into this line. A funnel and a piece of hose can help. After adding it, turn the engine off, let it soak for about 15-20 minutes, then restart. Expect significant white smoke as it burns off the carbon deposits—this is normal.
Adding Sea Foam to the fuel tank is the safest method. Use 1 to 2 ounces per gallon of gas to clean the entire fuel system, including injectors and intake valves. For the crankcase, add one can to the existing oil about 100-200 miles before a scheduled oil change. This helps dissolve sludge, but crucially, you must change the oil afterward as the contaminants will now be suspended in it.
| Application Method | System Targeted | Recommended Amount | Key Consideration |
|---|
| Vacuum Line | Intake Valves, Combustion Chambers | 1/3 to 1/2 can | Produces heavy white smoke; avoid on some direct-injection engines. |
| Fuel Tank | Fuel Injectors, Fuel Lines, Intake Valves (port injection) | 1 oz. per gallon | Safest method; can be used with every oil change for maintenance. |
| Crankcase | Engine Oil Passages, Piston Rings | 1 full can | Must be followed by an immediate oil and filter change. |
| Carburetor | Carburetor Jets & Passages | Direct spray or slow pour | For older vehicles or small engines; follow with high-RPM drive. |
