I did a search and not much said about using seafoam along side with auto-rx. I am about to be in my rinse phase. I have about 500 miles left on my cleaning phase. What i was wondering is would it be safe to use seafoam before i start my rinse phase of auto-rx? I would run seafoam through my brake booster line and also do a piston soak thru the sparkplug holes. Would this be safe or benefit the cause of using auto-rx to begin with? I guess would see foam used just before the next oil change harm the process of using auto-rx?
I have twice used a product called GM Top Engine Cleaner that I poured into the carburetor and let it stall the engine, I restarted it 15 minutes later to give it time to soak the pistons, then restarted it, the 1st time I did it it smoked for five minutes, the 2nd time I did it , it smoked for 30 seconds, now the 2nd time was 2 years after the 1st time, I did not notice any difference in how the engine ran, I think your best benefit is to run Amsoil PI or Redline Fuel Injection cleaner, I really do not see any benefit, what kind of car is this anyway, also realize that if you do this you may need to change the plugs and hopefully you do not mess up your oxygen sensor, another thing you can do is go on BITOG, or google seafoam testimonials and see what others have too say.
I think you would be fine running some seafoam in through the brake booster line, in attempts to clean up the intake some. I would not use seafoam for a piston soak unless you know for sure that your piston crowns are heavily carboned up. IMO seafoam should stay out of the crankcase or oiling system.
I'm leary of Seafoam, both having used it myself and reading post on Miata.net. No problems in "my cars" - cars I had for some time and always used good gas and Redline or Techron FI cleaner in the tanks on occation.
My Jeep was a different story - 4 banger bought used with ~90K. Thought would clean it up with Seafoam - ran rought (unlike the other cars) and then tripped the CEL. Oh man, thought I fried the O2 sensor. But it ran ok after a while (can't remember how long, few years ago). After ~ 1 year of staring at a CEL (okay, know not a smart thing to do, but I would always open the hood and check the engine and it was always there :) ). Unhook the battery to reset the code, never came back on.
Worry it might work TOO GOOD and cause problems. That's my 0.02.
