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Just another Kreen believer... #5320226 01/11/20 08:22 PM
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cfmistry Offline OP
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Well I decided to try some Kreen in my 160k-mile 2007 Tahoe. The first owner (who had it the first 120k miles) took good care of the car but the second owner.. not so much. The car was burning about 1 quart of oil every 3k miles (very common with the 5.3L and no big inconvenience), but the real problem was the visible oil burning every cold start - it was pretty embarrassing. Well only 250 miles into my Kreen experience, there is no longer any smoke at startup. None. The car idles a little smoother (there wasn't much to improve on there), and my mpg is up from 14.4 to 15.5 (with no other changes). Honestly I'm a big skeptic of these "tune up in a bottle" type cleaners since I've tried so many with no changes. Kreen seems to have done some good here, and I can still smell it burning so I can only hope there's more to come.

I am tempted to try it in my 2007 E63 but that M156 engine runs so clean and has so many sensors that I can only see bad things coming of it!

Last edited by cfmistry; 01/11/20 08:22 PM.
Re: Just another Kreen believer... [Re: cfmistry] #5320453 01/12/20 06:28 AM
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SteveSRT8 Offline
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Another kreen success story.

I have fleet trucks all GM 5.3's and 6.0 gas engines. Kreen does wonders when the mileage gets high, cleans the entire PCV system and gets the carbon off the heads, too!

Great stuff...


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: Just another Kreen believer... [Re: cfmistry] #5320480 01/12/20 07:27 AM
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Trav Offline
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Yep, good stuff indeed. One of the few product that works as advertised. If the engine has no issues then no you probably will not see any significant results.


ASE L1, Master. Deutsch Meisterbrief.
Re: Just another Kreen believer... [Re: cfmistry] #5320564 01/12/20 08:58 AM
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Audios Offline
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Did you add it to the oil, or fill the cylinders?


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI-T6 5/40
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
Re: Just another Kreen believer... [Re: cfmistry] #5320588 01/12/20 09:21 AM
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bruckus Offline
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What is the best way to use it? In the oil? Gas? Or directly in the cylinders?

Re: Just another Kreen believer... [Re: cfmistry] #5320596 01/12/20 09:30 AM
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Triple_Se7en Offline
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Originally Posted by cfmistry
Well I decided to try some Kreen in my 160k-mile 2007 Tahoe. The first owner (who had it the first 120k miles) took good care of the car but the second owner.. not so much. The car was burning about 1 quart of oil every 3k miles (very common with the 5.3L and no big inconvenience), but the real problem was the visible oil burning every cold start - it was pretty embarrassing. Well only 250 miles into my Kreen experience, there is no longer any smoke at startup. None. The car idles a little smoother (there wasn't much to improve on there), and my mpg is up from 14.4 to 15.5 (with no other changes). Honestly I'm a big skeptic of these "tune up in a bottle" type cleaners since I've tried so many with no changes. Kreen seems to have done some good here, and I can still smell it burning so I can only hope there's more to come.

I am tempted to try it in my 2007 E63 but that M156 engine runs so clean and has so many sensors that I can only see bad things coming of it!

Why are you withholding 'how you used it'? Now I won't be able to sleep - until you reply.....lol


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Re: Just another Kreen believer... [Re: cfmistry] #5320597 01/12/20 09:32 AM
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cfmistry Offline OP
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Hah! Sorry about that... I put it on the oil only (1/2 qt). I've used Techron twice through the fuel system so I figure it can't be too dirty. I will put the remaining 1/2qt in the oil once the first 1000 miles passes.

Re: Just another Kreen believer... [Re: cfmistry] #5320600 01/12/20 09:34 AM
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How much oil does the Tahoe hold? How thin is Kreen?

Last edited by Triple_Se7en; 01/12/20 09:35 AM.

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Re: Just another Kreen believer... [Re: Triple_Se7en] #5320626 01/12/20 10:15 AM
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cfmistry Offline OP
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Originally Posted by Triple_Se7en
How much oil does the Tahoe hold? How thin is Kreen?


The Tahoe holds 5.7L of oil, and the Kreen is very thin (like water). Other have stated that the oil will be noticeably thinner when drained/changed.

Re: Just another Kreen believer... [Re: SteveSRT8] #5320627 01/12/20 10:18 AM
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Propflux01 Offline
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Originally Posted by SteveSRT8
Another kreen success story.

I have fleet trucks all GM 5.3's and 6.0 gas engines. Kreen does wonders when the mileage gets high, cleans the entire PCV system and gets the carbon off the heads, too!

Great stuff...


I wonder if this would be good in GDI engines to get carbon off the intake valves? I emailed KREEN directly about it but got no response.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: Just another Kreen believer... [Re: Propflux01] #5320632 01/12/20 10:24 AM
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Originally Posted by Propflux01
Originally Posted by SteveSRT8
Another kreen success story.

I have fleet trucks all GM 5.3's and 6.0 gas engines. Kreen does wonders when the mileage gets high, cleans the entire PCV system and gets the carbon off the heads, too!

Great stuff...


I wonder if this would be good in GDI engines to get carbon off the intake valves? I emailed KREEN directly about it but got no response.


I'm sure chemically it would. But how do you get it across the intake valves in a DI engine? If it was available in a spray, that would be great! But i would not want to accidentally inhale it!!!

Last edited by spasm3; 01/12/20 10:24 AM.

13 elantra 81k 5w30 synpwr
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Re: Just another Kreen believer... [Re: spasm3] #5320681 01/12/20 11:31 AM
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Propflux01 Offline
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Originally Posted by spasm3


I'm sure chemically it would. But how do you get it across the intake valves in a DI engine? If it was available in a spray, that would be great! But i would not want to accidentally inhale it!!!


Perhaps by the use of a valve and a vacuum line (like what they used in older times for "water injection"), or a direct spray through the intake using a spray bottle of sorts.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: Just another Kreen believer... [Re: Propflux01] #5321432 01/13/20 10:23 AM
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Just passed 90 K on my GDI Jaguar XF Supercharged 3.0 V6 Pulled the Supercharger for some maintenance and repair the supercharger coupler.

Valves were nearly spotless ( was prepared to do walnut shelling to clean them up)

I use only top tier gasses and Techron every 3000 miles

The intake valves pass nothing except clean air, they get carboned up during overlap and cylinder burn (especially with VVT) I believe good gas and a bit of cleaner (any choice maybe but Techron has been my go to for years, will help.

I am not sure techron (or any gas treatment for that matter) would be good enough for a "cleanse" of badly carboned intake valves but if used regularly before carbon builds up seems to help (along with top tier gas)


2013 Jaguar XF 3.0 AWD Supercharged, Tuned 460HP Castrol Edge 5w-30 90k
2006 Saab 9-3 Aero 160K tuned 360 HP Mobil1 European 5W-30
Re: Just another Kreen believer... [Re: cfmistry] #5321583 01/13/20 01:18 PM
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SteveSRT8 Offline
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Propflux, the intake would have to be hot and the kreen introduced as a vapor for even a chance of even distribution. Dry intakes are not designed for the pooling and uneven distribution of a liquid.

I'll bet jssaab drives his supercharged jag a bit, people who use the engine rarely get gunked up anymore.

Note that VVT has been mentioned as a possible reason that some makes never need intake valve cleaning and reversion happens in almost any engine at some point in its operation...


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: Just another Kreen believer... [Re: cfmistry] #5322085 01/13/20 10:14 PM
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Propflux01 Offline
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Well, it was a thought. Its for a Hyundai 2.0 GDI. I don't know how bad the valves are, I have used Techron a few times. There are no issues, was looking mostly at PM for it.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
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