200k 2009 Prius with oil burning at 1qt for 1000 miles highway and less burning in stop and go.

That corona stain on the porcelain is also a problem. Were the plugs loose?

 

I haven't tried piston soaks yet. You sound like you've done it before and I don't know the procedure, but if you put Berrymans in the top end, maybe you want to follow with some MMO to lubricate the top end a little before you start up.

I did a cheap engine oil flush and ran a tank with Techron in it and I think it has helped reduce consumption, so I will flush again on the next oil change.

 

Berryman now has a combustion chamber cleaner kit. Wonder if it will have the same result.

Berryman® Intake Valve & Combustion Cleaner - Berryman Products

 

I've heard that Berryman's B12 piston soak is a good way to to free up piston rings that are stuck with carbon deposits.

You did dump and replace the oil and filter after the piston soak, right?

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Those plugs look nasty

 

NGK does not recommend the application of lubricant such as copper grease to spark plug threads as the result is a reduction of frictional forces at the thread faces. This will render the torque readings inaccurate and over tightening could occur by up to 20 percent
How to Change Your Spark Plugs & Why You Shouldn't Use Copper Grease | Driven 2 Automotive Blog

 

See this explanation

• If using anti-seize compound, use sparingly and reduce torque by 30%.
  
• it causes damage to the crushable sealing washer supposedly if over tightened.
  https://www.densoproducts.com/denso-plug-torque-settings
  

 

That's okay I'll take the extra torque by mistake it's not a problem and berryman's b12 and chem tool man I've been using that stuff for like 35 years very good stuff people over on my motorcycle form use it everything love the way it smells too

 

Like napalm in the morning.

 

Let us know your oil consumption after your 3k mile road trip. My Prius also has had high oil consumption on highways and less hp. Recently changed spark plugs and PCV. Did oil change. Now Monitoring oil consumption. Will update in a months time

 

I am the guy from Reddit who recommended the B-12 Soak... you should at the very least see a significant improvement.

My oil consumption has remained significantly improved. It was cured completely during the first oil change after the Soak using Supertech full synthetic.

I burned about a qt initially and then it stayed at the same level on the dipstick for over 2,000 miles after the Soak. Plus the oil stayed completely clean and didn't become black at all... just slightly more golden during the entire OCI... even with the initial quart of consumption.

I then topped off with Pennzoil Platinum Synthetic (known to cause oil consumption in the Prius) and it started to consume oil and turn black immediately.

Then the Pennzoil burned off and it turned golden again and stopped consuming oil. Was really strange.

Now I'm consuming some oil again back on SuperTech but it is significantly improved still. I use to consume a quart every 1-2,000 miles and the oil would turn dark almost immediately. Now consumption is about a qt. Per 4,000 miles and the oil is still a nice golden color 4,000 miles in.

Going to try another B-12 soak at the next oil change and stay away from Pennzoil... which I think may have precipitated my consumption problems again.

Also note I did a MMO soak before thr B-12 and it did absolutely nothing. MMO is too weak. You need the strong solvents in B-12.

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Hmm, no noticeable oil consumption in our 2011 Prius hatchback at 130k miles. But the oil is very dark at 5k OCI. Using Mobil 1 0w-20 full synthetic oil.

EGR circuit fully cleaned, intake manifold and EGR passages cleaned, OCC installed at 124K.

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Did you replace the PCV valve or just clean it?
Was it dirty?