I have a honda prelude w/ a 2.3 H23A1 block that has 160,000 miles and i began to look at sea foam to clean it. My friend used it on his trooper but it also has less miles on it and i was worried that using it might make my engine start smoking? I know it does for a little while after you use it but i mean like it would cause damage or pre-existing damage to show more. Anyways im good w/ cars but ive always been a little scared of addatives. Any help would be great. thanks