Concerns

As with any product, negative effects are always a possibility, but only under rare cirumstances such as:

• Hydrolocking the engine: This is not possible to do through an ordinary vacuum line because not enough Seafoam can be drawn without stalling the engine first. The only way is if the etire can is somehow emptied by other means very quickly or if too much is poured into the spark plug openings (see above).
• Heat warping valves: Some claim that injecting Seafoam directly will cause a lot of stress on the valves by cooling them too quickly and result in warping. Valves are already cooled slightly by the fuel and intake charge as it passes by them and are designed to handle the temperature difference. This scenario is unlikely.
• Dropping a valve seat: On certain engines which are prone to valve seat failure, using Seafoam might provide the slight temperature difference needed to get the valve seat lose and end up in complete engine failure. An example of this happened on a Ford Escort after running Seafoam.
• Creating leaks: Whether compression or oil leaks, some can develop on rare occasions if the engine is held together by dirt and Seafoam cleans that dirt away. Also a very rare scenario, as experience shows that running seafoam through 4 cylinder engines with even 200-300 thousand miles does not create negative effects.
• Releasing contaminants into oil: If the engine contains excessive amounts of sludge, what can happen is some of the sludge that would otherwise stay in place will get freed up from the use of Seafoam and begin to travel throughout the oil system. Ruining bearings, clogging up filters, and clogging up the oil sump screen mesh, effectively starving the engine of oil. This is why the procedure should only be performed just prior to changing the oil and oil filter.

The massive amounts of white smoke that is created from running seafoam is very entertaining and often times the best part of the experience. Some may worry that it can lead to getting pulled over or other problems. However police usually do not have an issue with it, and understand that it is temporary. The chances of getting violations or legal problems from running the car on a major street after using seafoam are slim to none. However it is recommended not to do this in a parking lot close to other cars as smoke will enter other cars or buildings and create unecessary tension.