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Thread: How To: Seafoam

  1. #1

    Default How To: Seafoam

    well since there arent too many How-Tos in this section yet i might as well add this one since i have seen many other forums have it but yet to see it on here anywhere

    i am going to run through the steps to seafoam the oil, gas, and brake master cylinder line. if you have never heard of seafoam here is a link to thier website:

    personally i use it in my gas tank and master cylinder line, i havent tried it in my oil yet just becuz i have been told to change your oil soon after using it, not sure why, i just havent gotten around to the end of a oil change yet to add it.

    i know this works from personal experience and the 100s of people that i have talked to on this and different sites that have also had it work.

    things you will need:
    1: can of seafoam motor treatment(can be found at any autoparts store, and walmart)
    2: small cup
    3: a friend that can follow simple instructions

    step 1 adding to oil(optional):
    1: add 1/3 can of seafoam to oil
    2: drive for probably a good 100-300 miles
    3: change oil, make sure you let it drain all out!

    step 2 adding to gasoline:
    1. add 1/3 can of seafoam to gas tank
    your done!

    step 3 running it through master cylinder vacume hose
    1. 1/3 can of seafoam in small cup
    2. remove vacume hose from master brake cylinder
    3. have buddy start the car and hit the gas while you Pour the seafoam in slowly
    4. as soon as cup is empty shut off car and wait 10min
    5. start car and rev engine and watch all the white smoke poor out the back
    6. after a few min of reving the engine drive the car around for a few miles while letting the RPMs get high

    after this your car should run a bit better, this might not work as well on newer vehicles becuz they havent had 150k miles to build up a bunch of crap in there but it couldnt hurt anything i dont think.

    if i missed anything feel free to PM me and ill add it
    Last edited by sheep; 09-01-2008 at 12:31 PM.

  2. #2


    i had posted this on another web site ( and had a rep write in and said your step 3
    "3. have buddy start the car and hit the gas while the hose sucks up the seafoam"
    this should read 3. have buddy start the car and hit the gas while the Pouring slowly some SeaFoam
    if you just "suck" the fluide you might get too much and hydro lock the motor. i done the suck it in till it stalls many times and no issuse but the one time it can happen it will be a complete lose so i now pour as seafoam asaid and turn off the motor if it does not stall out.....mike
    Michael Collins
    1993 4X4 Suburban
    many other toys as well

  3. #3


    ok made the correction, thanks!

  4. #4


    never an issue. i just want to pass the correct way (i still done both ways but i feel bad if someones else lock-up a motor and pass the blame. so this will just help protect the

  5. #5


    yeah seafoam works great

  6. #6
    TRPLXL2's Avatar
    Join Date
    Jan 2009
    Norwalk, Ohio
    Blog Entries


    Thanks for posting this, I actually just bought 3 cans of the seafoam last weekend at the recommendation of the members on this site. I hope it helps a little bit on my S-10, it only has 54,000 miles so I'm not sure if it will do that much or not but it's worth a try. I just have to wait for the weather to get better, and then I will tell you how my experience goes.
    2004 Chevy Colorado
    LS1 5.7 swap/TBSS rear axle swap

  7. #7


    Is Seafoam safe for O2 sensors & catalitic converters?

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  8. #8

    Thumbs up how to seafoam

    Thanks for the info!!

  9. #9


    Additives that contain Zinc poisons your cat converters, Seafoam does not contain Zinc.

    2009 Silverado 1500
    5.3L / 3.73 G80 / 4spd / 4x4 / LWB/ Ext Cab / HD Tow-Haul
    2.25in ReadyLift Level Kit / 3in blocks/ 3500lb HellWig / 265x65x17 Wrangler AT
    K&N Filter / AirRaid MIT / MagnaFlow 2.25" Dual Exhaust / HyperTech MaxEnergy

  10. #10
    Jr. Apprentice Senshi09's Avatar
    Join Date
    Feb 2012
    Warren, Ohio
    Blog Entries


    Wow, I didn't realize im only supposed to use 1/3rd of the can in the gas. I use the whole can... hope that doesn't mess things up.
    Whats Big, Black and sits low in the front?
    Black Beauty!!

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