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Pics - Top Piston Cleaning - Lexus CT200h #5266589 11/14/19 12:14 AM
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KerryB Offline OP
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Long time member here. Finally coming back since my 2jz turbo days running GC. Now driving something more economical.
I just picked up a used Lexus CT200h with 125k miles. Previous fills were done at the dealership 0w20 conventional.
After the first week of owning it I noticed high oil consumption 0.5qt/600mi so I did a top piston soak with MMO and GM top engine cleaner. Hoping to free up the piston rings and planning on running Synthetic Maxlife 10w30 (or any suggestion?).

The first 2 pics are after an overnight soak of MMO. The carbon was very soft and was easily scraped off when my endoscope touched the carbon. The 2nd 2 pics are after a 2nd night soak with 50/50 mix of MMO and GM and a couple dry cranks. Last pic is from the last the soak.






F47922D4-71CF-4248-BE9E-853422FB429D.png793C9599-60C1-4BC9-93A1-D87A59AE6621.pngA4D46EA2-460F-43B6-A2F0-4E95A74EED60.pngCF581735-2C61-4DDA-85FF-CBAFB1F36D61.png7E5EF1BC-907A-478F-AABE-4AA6ECF26885.png
Last edited by KerryB; 11/14/19 12:29 AM.

Lexus IS300 12 psi @ 420 rwhp, 17 psi max w/ progressive meth. inj.
Redline 10w30
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: KerryB] #5266604 11/14/19 01:03 AM
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OilUzer Offline
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0W20 comes in dino?

Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: OilUzer] #5266611 11/14/19 01:41 AM
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KerryB Offline OP
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Originally Posted by OilUzer
0W20 comes in dino?


Thanks for spotting that. Not sure. The previous owner only did oil changes at the dealer.


Lexus IS300 12 psi @ 420 rwhp, 17 psi max w/ progressive meth. inj.
Redline 10w30
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: KerryB] #5266614 11/14/19 01:50 AM
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Looks like a great job.


2007 Hyundai Santa Fe AWD.
2005 Toyota Avalon XLS
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: KerryB] #5266624 11/14/19 02:56 AM
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Looks good. You'd have (eventually) gotten there with just the MMO seeing's how it's mostly kerosene and Stoddard solvent... but the GM cleaner helped it along. Last I recall Chevron was mfg the ACdelco top end cleaner, if that's still the case it's a good bet there's some Techron in it.

Nicely done..👍

Last edited by Mad_Hatter; 11/14/19 02:59 AM.
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: Mad_Hatter] #5266639 11/14/19 04:30 AM
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pbm Offline
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Originally Posted by Mad_Hatter
Looks good. You'd have (eventually) gotten there with just the MMO seeing's how it's mostly kerosene and Stoddard solvent... but the GM cleaner helped it along. Last I recall Chevron was mfg the ACdelco top end cleaner, if that's still the case it's a good bet there's some Techron in it.

Nicely done..👍


Would adding actual Techron to the MMO accomplish the same thing since it's easier to procure the the GM stuff?


'Journalism is Dead'
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: KerryB] #5266657 11/14/19 05:55 AM
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D1dad Offline
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Nice work. I’m interested how the consumption does moving forward. I’m trying, and having success using kreen in my alitima oil burner (2009). All I’ve done is treated the oil and the fuel and have reduced the usage by a significant amount but I think I’ll do and ounce in each cylinder overnight when I get some time over thanksgiving. Love seeing results like this, good job!

Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: KerryB] #5266681 11/14/19 06:35 AM
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Donald Offline
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Techron cleans and prevents. Forget the MMO.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: D1dad] #5266682 11/14/19 06:37 AM
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BMWTurboDzl Offline
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I'd bet the vehicle never spent more than an hour at highway speeds.
Originally Posted by D1dad
Nice work. I’m interested how the consumption does moving forward. I’m trying, and having success using kreen in my alitima oil burner (2009). All I’ve done is treated the oil and the fuel and have reduced the usage by a significant amount but I think I’ll do and ounce in each cylinder overnight when I get some time over thanksgiving. Love seeing results like this, good job!


Expect it to return. I'd bet the vehicle has never spent more than an hour at highway speeds let alone speeds of 70 mph or more. The OP just as likely would've reduced consumption by just going on an extended road trip.


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

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Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: KerryB] #5266684 11/14/19 06:40 AM
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jbutch Offline
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I wonder if using Top Tier gas would help prevent this?


2015 Forester XT @ 104k km
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Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: KerryB] #5266696 11/14/19 07:06 AM
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Do a piston soak with Berryman B-12 Chemtool and all of the carbon will be removed and if the rings are partially stuck due to carbon those will be loosened as well.


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge 0W-20 + FRAM Ultra]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum Euro 0W-40 & Mann filter]
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: jbutch] #5266711 11/14/19 07:25 AM
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Originally Posted by jbutch
I wonder if using Top Tier gas would help prevent this?

Using TT fuel will certainly minimize deposits but I don't think TT makes any guarantee that you won't get ANY deposits. Excessive carbon buildup can happen due to leaky injectors or excessive oil in the combustion chamber due to loose rings or valve seals for example, no TT fuel can remedy that. But whatever you use to keep the carbon on the piston tops to a minimum is better than nothing. Too much carbon can cause a host of problems.

Berrymans is my personal go to for piston soaking but I've used MMO before..in fact I used MMO when I replaced the plugs last year. I figured since I had the plenum off I might as well soak the pistons on that bank (1). Soak the pistons, change the oil and call it good. I don't get to soak the bank 1 pistons very often because it's kind of PITA to take that plenum off.

Originally Posted by pbm

Would adding actual Techron to the MMO accomplish the same thing since it's easier to procure the the GM stuff?

Don't see why not.

Last edited by Mad_Hatter; 11/14/19 07:31 AM.
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: OilUzer] #5266757 11/14/19 08:22 AM
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Originally Posted by OilUzer
0W20 comes in dino?

Most "full synthetics" are what had been referred to as "Synthetic Blends".

But to answer your question, the lower tier of 0W20 are blends of synthetic and refined mineral oils,

The upper tier products - Mobil 1 AP, Amsoil SS - are majority synthetic base oils from what we can glean from SDS and performance data like MRV and ASTM D5800.08 NOACK volatility.

And synthetic oil products are NOT made in a lab despite ridiculously incredible advertising.

Developed? Yes; Manufactured ? NO.

Last edited by ARCOgraphite; 11/14/19 08:25 AM.

2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: KerryB] #5266766 11/14/19 08:26 AM
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Looks good. Thanks for the Pics. How much MMO and GM cleaner did you use in each cylinder?


2015 Grand Caravan SXT Plus 0w-20 Pennzoil Ultra/Fram Ultra Filter
1997 Honda Civic CX 5w-30 PPPP/Fram Ultra Filter
Re: Pics - Top Piston Cleaning - Lexus CT200h [Re: KerryB] #5266783 11/14/19 08:36 AM
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Yes you cleaned the tops of the pistons.. but how did they get so much carbon? Likely your valve stem seals. SInce you mention oil consumption that is a likely culprit.

How did the plugs look?

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