How do I Get Rid of Auto Engine Slug?


Auto engine sludge -- or slug -- is bad for an engine, as it makes the engine run hot, insulates the surfaces from being able to efficiently exhaust heat and prevents oil from draining like it should, resulting in over consumption of oil. It also plugs up the engine's internal breathing, eventually causing oil leaks and other unsightly problems. Luckily there are easy things you can do to rid your engine of oil sludge and also even prevent oil sludge from building up in the first place.

Things You'll Need

  • Synthetic engine oil
  • Sea Foam engine treatment
  • Auto mechanic
  • Perform an oil change or take your vehicle to an auto mechanic and ask him to do so. This will require both the oil and oil filter to be changed out completely. Replace with a purely synthetic motor oil such as Castrol GTX. This will aid in cleaning away any existing sludge while keeping it from reforming.

  • Change the oil in your vehicle every 1,000 miles or each month until your engine begins running clear. Once it has, you may switch back to the 3,000 mile maintenance schedule. This will ensure that the engine is fully cleaned of sludge so that regular maintenance later may keep it from building back up.

  • Add Sea Foam motor treatment to you vehicle. Make sure the engine is at operating temperature, then find a vacuum line that feeds all cylinders, such as the PCV hose or the vacuum brake booster line. Disconnect the vacuum line and slowly pour Sea Foam into the vacuum line with the engine at idle. Pour in 1/3 to 1/2 can of Sea Foam, then shut the engine off and let it sit for at least 10 minutes before reconnecting vacuum line. Restart the engine.

  • Have the engine flushed at your local mechanic shop every 40,000 to 50,000 miles.

  • Closely monitor your engine for any signs of gathering sludge. If the engine is not running sluggishly or hot, or if the engine stalls, take your vehicle to an auto mechanic right away. Other signs may include noticeable oil leaks and smoke from the tailpipe.


  • Photo Credit engine image by Tomasz Pawlowski from
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