Sea Foam?

ASSISTANCE Stock Engine-Bay Components
1

So i looked up sea foam but not much really helped. I keep hearing different things about it good/bad.
Is it really bad to use on high mileage cars?
i have a 90 gs with 135,xxx miles.
i used to have a 90 LS with 200,xxx miles and i sea foamed it and about 2 weeks later engine died on me but wasnt sure if it was cause the “sea foam”… But is it good or bad for the car?

2

Sea foam is bad in a high mileage engine if you do the sea foam process (smoke show) for more than 10-15 mins. You’re at the perfect amount of mileage to do sea foam safely for 20 mins. Just be sure to change that oil after you’re done. I was ok with sea foaming my motor and I have 193k miles.

3

oh yeah forgot to mention reason why i wanted to try it… Ive had black smoke coming out my car only when i reach high rpms. When i had the car smogged the guy said im running a little rich. i did a oil change cause the oil was hella black. My friend recommended to use sea foam and that it might help the problem. and i believe i am burning oil but not hella.

4

honestly all car burn oil or atleast have a black cloud of smoke come out a straight flow exhaust in high rpms. I have no cat and run my fuel rich and can see a small black cloud in the back when I rev my itr engine to 9k

5

How did you seafoam you old engine?

There are three main ways of using seafoam.

  1. Through the intake. This can be done through a vacuum source. most people just use the brake booster hose.

  2. Add into the engine oil. IMPORTANT! You must change oil shortly after. Add into the engine oil, let it run for about 15-20 mins, then cool down and perform a full oil change.

  3. Add into the gas tank. Cleans your fuel system.

If you did number 2 on your old engine but didn’t change the oil afterwards, then YES I can see it dieing on you. The seafoam will eventually break down the oil, and your crank and rode bearings will seize up.

In my experience, there is absolutely no harm in doing number 1 and 3 on ANY engine regardless of mileage. I’ve seafoamed my old LS with 320k+ (kms) with no problem with methods 1 and 3. HOWEVER, On high mileage engines, it is recommended NOT to use method 2 because it can compromise the piston ring seals, and valve seals.

6

is 135 almost 136 considered high mileage? or would you think its safe for the miles in my car?