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I tried the engine flush as I had an annoying misfire and rough running when the engine was cold. Background info... On last years service the mechanic commented on the dirtiness of the oil he drained. Since that oil change Occasionally the EMS light has been coming on. Saab Diagnostic readout showed misfire cylinder 2. I swapped the coil pack. Running improved but problem was not fully cured. Diagnostic readout now said multiple misfires but the Ems would reset itself as the engine warmed up and running smoothed out. I was told my hydraulic valve lifters were probably gummed up and stripping down was the best (but pricey) cure. My engine is a 2007 saab 2 litre turbo 1.8t by the way, which has 89k on the clock. Result... I put the Comma engine flush in and ran the car for 5 days and 200 (including 140 on the motorway) miles before doing an oil and filter change. Now... all is quiet and more silky smooth than I ever remember it in 55000 miles of owning the car. I'll definitely use Comma engine flush again and recommend it!Read full review
Verified purchase: Yes | Condition: New
This stuff works. Simple to use - just pour it into your engine shortly before an oil change, and run the engine for a while, or drive around as usual. Effective - if your engine has any gunk in it this will loosen it up and mix it with the oil, turning your oil a few shades darker. Mine came out looking like crude. Then change the filter (cheapest available), refill with Flushing Oil (highly recommended for older engines), run the engine again, then drain, fit a good quality filter and fill with the correct grade of oil for your engine. It will stay looking like new for miles and miles, which is all the evidence you need that the Engine Flush was effective, thorough and definitely worth doing. And at this price, you'd be foolish not to.
Verified purchase: Yes | Condition: New
Having used the former diesel/petrol versions of this product for over 10 years the combined version is equally effective. Only product on market that works while you drive and delivers the results claimed.
Verified purchase: Yes | Condition: New
Probably the best engine flush. This one is more of a oil based one and not just thin solvents like many others are, hence you can actually drive the car with this in. I would assume it just has a much higher detergent concentration mixed with a synthetic base oil. Ill be using this from now on in combination with a mineral oil flush at the same time.
Verified purchase: No
I bought the six pack as it represented good value for money. Works well at removing the muck from the engine, I usually put it in and use the car for about 50-60 miles to give it a good thorough clean.
Verified purchase: Yes | Condition: New
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