Engine Carbon Cleaner: The Test Results
This head-to-head test of 1 engine carbon cleaner options has the measured results for each. See how they ranked and watch the full test video.
Antifreeze 50% water / ethylene glycol mix
Affiliate link. We may earn a commission at no extra cost to you.
The measured results
Every number below is read straight from the test. Products are listed in the order they finished.
All measurements (4 more)+
Spray mist test
- 1Antifreeze 50% water / ethylene glycol mix
did the spray mist actually help? I think it did. There's quite a bit of cleaning through the center part of the piston as well as around the intake valve
Drip method test
- 1Antifreeze 50% water / ethylene glycol mix
well, I'm really surprised at how well that worked. I did not expect the drip to work so much better than the spray mist
Compression test
- 1Antifreeze 50% water / ethylene glycol mix
Compression test 105 PSI ... Compression test: 105 PSI (no change)
Oil contamination check
- 1Antifreeze 50% water / ethylene glycol mix
I don't see any visible contamination. In other words, it's not a milky white color
How it was tested
- spray mist carbon cleaning test on a running, fully warmed engine
- drip method carbon cleaning test through the carburetor
- compression test before and after treatment
- visual oil contamination check
“Well, I'm really surprised at how well that worked. I did not expect the drip to work so much better than the spray mist.”
More Fuel & Additives
Which Fuel Stabilizer (plus A Separate 1-year Headlight Restoration Kit Durability Check-in) Brand Wins?
Sta-Bil
See the results
Which Diesel Anti Gel Fuel Additive Brand Wins?
Hot Shot's Secret
See the results
Which Gasoline Octane Grade Brand Wins?
87 Octane
See the results