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2007 Prius Piston Soak #5308734 12/30/19 11:55 PM
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JRed Offline OP
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My '07 Prius has been consuming roughly 1 quart per ~1000 miles for the last 100k miles or so. I figured a piston soak was relatively low effort, low cost, and (hopefully) low risk. I've already replaced the PCV several times and run Castrol Edge high mileage on 5k OCIs. I removed the spark plugs and was greeted by this:


This was just after removing the plugs on a still warm engine. Tops of pistons 2/3 look pretty awful compared to 1/4 (to me anyhow).

I ended up going through two 12oz cans of Berryman's B12. I put a few ounces in each cylinder and rotated the crank by hand a few revolutions, poured a bit more, replaced spark plugs (loosely), and waited a few hours. Rinse, repeat until I was out of chemtool. Let it sit overnight and dumped the now pitch black oil and replaced with fresh. I also replaced the PCV and cleaned the MAF/throttle plate and whatever oil/etc. had accumulated beneath the throttle body in the intake plenum. Blew any remaining chemtool out of the cylinders, threw the old plugs back in, and started it up.

Billowed smoke for a few minutes but ran well otherwise. Drove it like a maniac for ~20 minutes, let the engine cool, and replaced the plugs with fresh ones. I accidentally deleted the "after" video I took, but all of the pistons looked like the top of #4. It certainly seems to run better, but I'll report back when I know more in regards to oil consumption.


06 Subaru Impreza WRX - Sold. The only mechanical thing I'll ever love.
07 Toyota Prius - Devourer of Oil
Re: 2007 Prius Piston Soak [Re: JRed] #5308745 12/31/19 12:03 AM
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dogememe Online Content
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Very interesting, please keep us updated on if it reduced oil consumption! Thanks.


2010 Ford Escape 2.5 ~102K Miles: Castrol Magnatec 5W-20, Wix Filter.
2001 Chevy Suburban 5.3 ~290K Miles: Valvoline Maxlife 10W-30, ACDelco Filter.
Re: 2007 Prius Piston Soak [Re: JRed] #5308761 12/31/19 12:37 AM
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splinter Offline
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Originally Posted by JRed
Drove it like a maniac for ~20 minutes...
Nice!


PUP 0W-40
Total Quartz 5W-40
M1 5W-50

Past performance is no guarantee of future results.
Re: 2007 Prius Piston Soak [Re: JRed] #5308875 12/31/19 07:13 AM
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Kira Offline
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Indeed. I didn't know one could drive a Prius like a maniac.

Re: 2007 Prius Piston Soak [Re: JRed] #5308900 12/31/19 07:53 AM
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Donald Offline
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The oil being pitch black is a positive sign.

You could keep doing this until it is no longer pitch black after an overnight soak.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: 2007 Prius Piston Soak [Re: Kira] #5308926 12/31/19 08:14 AM
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JRed Offline OP
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Originally Posted by Kira
Indeed. I didn't know one could drive a Prius like a maniac.


Ride with my wife.


06 Subaru Impreza WRX - Sold. The only mechanical thing I'll ever love.
07 Toyota Prius - Devourer of Oil
Re: 2007 Prius Piston Soak [Re: JRed] #5308963 12/31/19 08:46 AM
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JRed Offline OP
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Also, I was using NGK IFR5T11 (#4996) and the plugs were TRASHED. Perhaps 80,000 miles on them and the gap was well out of spec. I was pretty surprised considering the set prior to these had around 100k on them and looked nearly perfect.


06 Subaru Impreza WRX - Sold. The only mechanical thing I'll ever love.
07 Toyota Prius - Devourer of Oil
Re: 2007 Prius Piston Soak [Re: JRed] #5308990 12/31/19 09:11 AM
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"I ended up going through two 12oz cans of Berryman's B12"

According to Berrysmans site...

B-9 is now known as Professional Chem-Dip (part #0905), while B-12 Chemtool can be either our carburetor cleaner aerosol (parts #0117 and #0120) or a pourable fuel treatment (part #0116). In either case, B-12 Chemtool is not well-suited as a parts dip due to its fast evaporation rate and it’s extreme flammability. If you have parts that require extended soak times, such as stuck piston rings or old metering blocks, then Chem-Dip is your best bet.

https://www.berrymanproducts.com/question/berryman-b12-verses-berryman-b9-carb-dip-cleaner/

Re: 2007 Prius Piston Soak [Re: JRed] #5309020 12/31/19 09:40 AM
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I've done piston soaks on saturns, mostly stick shift ones, and know the runs-better feeling. The engine was directly connected to the wheels, underpowered, and I could feel the timing map where certain ranges were retarded.

A prius-- I have several now-- would be challenging to "feel" engine performance as it throttles up and down on its own whim, vaguely related to accellerator input. I bet they can get pretty sick, with the electric drive covering for it, before the owner takes action.

Hope all works out for the best!

Re: 2007 Prius Piston Soak [Re: JRed] #5309035 12/31/19 09:51 AM
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simple_gifts Offline
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How many total miles on the Prius; Mine was short tripped until 65K and I have to run 89 octane to prevent pinging after the engine is "hot to the core" (which in winter isn't too often)

I've been toying with adding Echo's Red Armor 2 stroke, which apparently is formulated to attack carbon deposits.

I'm not in oil burner mode but it is probably just a matter of time.


2004 Prius; 126K; ALM
2007 Yaris 103K ATM
2006 B2300;137K;ALM


Was driving an ox cart; Now on the USS Enterprise
Re: 2007 Prius Piston Soak [Re: eljefino] #5309043 12/31/19 09:59 AM
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Originally Posted by krismoriah72

Yep, I realized my mistake once I'd started. The B12 does flash off VERY quickly, unfortunately. I considered fogging the intake with it but was too chicken to do so. Next time I have 2-3 days to experiment I'll try the B9.
Originally Posted by simple_gifts
How many total miles on the Prius

245,000 miles right now. It has rarely been short tripped -- every time it leaves the garage it gets driven at least 50 miles.
Originally Posted by eljefino
A prius-- I have several now-- would be challenging to "feel" engine performance

I can't say it feels any faster, but the engine doesn't seem to be revving as high when accelerating. Seems to make sense considering how the hybrid system works.


06 Subaru Impreza WRX - Sold. The only mechanical thing I'll ever love.
07 Toyota Prius - Devourer of Oil
Re: 2007 Prius Piston Soak [Re: Kira] #5309187 12/31/19 12:37 PM
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nthach Offline
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Originally Posted by Kira
Indeed. I didn't know one could drive a Prius like a maniac.

I do it occasionally - Uber drivers do it all the time.

FWIW, Prii don't handle too horribly but then again you can only do so much with 185/65-15 or 195/65-15 tires with a solid rear axle. The 4th gen cars on the new Toyota platform with 4-wheel independent suspension feel better.

Re: 2007 Prius Piston Soak [Re: JRed] #5309197 12/31/19 12:44 PM
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I used BG EPR and Liqui Moly Engine Oil Cleaner to get my consumption down, my car was a family hand-me-down that I did all the maintenance on. I was able to get the consumption down from 1qt/2000mi to 1qt/3000mi.

This weekend, I went over to The Critic's shop and I did an OCI with Valvoline Premium Blue Restore and a Fram Ultra. Let's see if that cleans up the ring packs and oil return holes. I kinda want to pull the engine out and do a re-ring but I gotta wait until I have a 2nd car and time on my hands.

My suspicion of why Prii drink oil is low tension rings + being a hybrid, the engine doesn't get a proper break in as you can't really get to redline nor vary the engine speeds under load. Corollas also drink oil - again low tension rings. Toyotas seem to be hard on their oil, yet their V6/V8s and I6s aren't known to drink oil. I had an 1991 LS400 that would occasionally drink but it had 297K when I got rid of it and the Sienna my parents have doesn't drink at all.

Re: 2007 Prius Piston Soak [Re: JRed] #5309280 12/31/19 02:09 PM
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I did something similar to our old '06 Prius that began burning oil, only I used Kroil and put some in the tank as well. I did switch to Valvoline HM in a 5w/30 afterward and it slowed/stopped the burning until will got rid of it 20k later. I don't know if it was the Kroil or the Valvoline or the combo, but it worked for me so I didn't question it.

Good luck to you!


'16 Toyota Prius 4
'15 Honda Accord Sport
'14 Victory Cross Country Tour
'13 Toyota Prius 3
Re: 2007 Prius Piston Soak [Re: JRed] #5309282 12/31/19 02:13 PM
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You think fuel brand / grade had an impact on this?


2015 GMC Canyon 3.6
2018 Mustang Ecoboost Convertible
2018 Mustang Ecoboost
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