Fag!
ive used seefoam on my 240 , and didnt have any issues.
I used seafoam and my headgasket blew a few days later at 215 *** I dont know if it was the cause of it…
Carbon buildups in your old tired high mileage motors will help seal things, and mask how tired and high mileage they really are.
Here is a way to get rid of carbon deposits for free, go out and drive the snake out of your car.
I used seafoam in my S13 on friday morning actually didnt have any problems fixed all my idling issues made the car drive smoother cleaned out the entire intake system and everything just becarefull not to use too much it worked out great 10$ bottle was well worth it because i tried every single carb cleaner in the world to fix my iacv problem and this thing did it in 1 shot.