Is the inside of a factory Gen 2 Prius oil pan painted?

Discussion in 'Gen 2 Prius Main Forum' started by TheLastMojojomo, Dec 27, 2020.

  1. TheLastMojojomo

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    Hi all,

    I am going to do a Berryman B-12 piston soak soon to attempt to cure an oil burning problem.

    Just wondering if any members here know if the factory oil pain for a 09 Prius is painted on the inside.

    I am worried that the Berryman B-12 could strip the paint and clog the oil sump unless I remove the pan beforehand.

    I have read a couple of posts about people doing B-12 soaks and having no issues in regards to oil pressure or sump problems after.

    B-12 piston soak procedure I read about.

    This user did not remove the oil pan and had no troubles after the soak.

    Just trying to be extra careful and will probably remove the pan anyways just to be safe unless I get a concise answer.



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  2. SFO

    SFO Senior Member

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    Never heard of the "inside" of an oil pan being painted before. You will be fine, no need to drop the oil pan.

    Though it shouldn't be an issue either way, you may want to set the pistons at the half stroke.

    How many miles on the vehicle, what is your oil change interval, and what brand/weight oil have you been using?
     
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  3. jerrymildred

    jerrymildred Senior Member

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    I sure hope it's not painted. :eek:
     
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  4. TMR-JWAP

    TMR-JWAP Senior Member

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    Looking at ebay auctions for used Prius oil pans, it appears the bottom stamped steel pan is painted black, inside and outside. Regardless, I doubt it will cause any issues. You can always try rubbing some solvent on the outside of the pan to see if it causes problems with the paint.

    Oil Pan 2008 Prius Sku#2347310 | eBay
     
  5. jerrymildred

    jerrymildred Senior Member

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    Wow. Must be really good paint.
     
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  6. TheLastMojojomo

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    09 Prius Touring with 170,000 miles on it. Been burning oil ever since I bought the vehicle and switched to 5w-30 full synthetic before 100k.

    Used mostly Mobil One but lately have tried other brands.

    Tried SuperTech full synthetic, same burn rate.

    Now trying Pennzoil Platinum full synthetic, burn rate seems increased but haven't driven too much with this oil.

    Am mostly driving my 2004 Honda CR-V right now as it's my winter mail carrying vehicle.

    I Change the oil every 5,000 miles and burns a quart every 1,000 - 1,500 miles or so.

    Lot of aggressive high rev start and stop driving though as it's a mail carrier vehicle and I'm sure that increases the burn rate from what it would be.

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    #6 TheLastMojojomo, Dec 28, 2020
    Last edited: Dec 28, 2020
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  7. SFO

    SFO Senior Member

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    I've read others report PP oil having an increased burn rate as well.

    Yes, higher RPMs may increase consumption. You might try using a thicker oil, like a 0w40 or a 5w40.

    Sounds like a perfect candidate for a soak, and please post the results here.

    Have you already tried using the B-12 chemtool in the engine oil right be an oil change?
     
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  8. edthefox5

    edthefox5 Senior Member

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    Move up to 10-40 weight asap and soaks seem to work well and a catch can.

    My very well maintained G2 started using a little oil at around 110,000 miles. I watch it carefully use was about a little less than 1/6th of a quart between oil changes.

    So I found a few things that really helped. Use a very high quality oil at 40 weight and also if its a little bit over filled it seems to use less oil. My minor oil loss has completely stopped doing these 2 things and I beat on it pretty good now with the new Red Bullet I installed. It goes now.
    I keep the oil oil level at 1/8th of an inch over the full line always.

    I use 10-30 Redline Motor oil which they tout as essentially a 40 weight oil at op temp. Catch can is not necessary if you use excellent quality oil.

    I'm now at 160,000 miles. Here's some pics of the engine at 155,000 miles. This is a very clean running engine Its all about the oil quality.
     

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    #8 edthefox5, Dec 28, 2020
    Last edited: Dec 28, 2020
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  9. TheLastMojojomo

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    Just wanted to update this thread as I just finished doing the Berryman B-12 piston soak.

    B-12 is definitely some potent stuff.

    Did the Piston Soak Procedure and can confirm it definitely dissolves carbon.

    Took a screw driver to the piston head after going through the 2 cans of B-12 and the carbon scraped off to bare metal like wet mud.

    Also I think the risk to the paint on the oil pan is minimal. I noticed when draining the oil after the soak the B-12 seemed to sit on top of the oil. The oil drained out for about the first 10 seconds followed by the B-12. The flow, consistency, and smell of the fluid changed to B-12 after about 10 seconds when the first 10 seconds of drainage appeared to be pure oil. The B-12 is probably less dense than the oil.

    Car ran rough the first minute or so and was struggling to get combustion but once I got in the car and floored the accelerator it came to life pretty quick.

    So far I've noticed the ICE starts and stops smoother. Less vibration it seems.

    Will keep this thread updated and start a second one if I notice significant improvement in my oil burning. I should know by next week if an improvement is to be seen.

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  10. TheLastMojojomo

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    UPDATE: SUCCESS! 300+ miles and the dipstick hasn't budged a millimeter. Reads just above the full mark about an hour after shutoff. Normally at this point I would at least see some noticeable oil loss.

    Note that before this I have tried multiple things, multiple times, like engine flushes with liquimoly, sea foam, and Marvel Mystery Oil (MMO). Changing the PCV valve. And Fuel additives which helped marginally by increasing engine MPG and power.

    I also did a piston soak with MMO in the summer of 2019. The MMO soak didn't do a thing.

    But I think the Berryman B-12 piston soak has done the trick. Still a bit too early to confirm this for sure but the evidence is highly promising.


    I'm going to replace the Spark Plugs in a couple days as the current ones were badly fouled and have 70,000 miles on them anyways. One plug also fell off a shelf and took a hard fall on concrete.

    One negative I have noticed is that I seem to get poor power in the high rev ranges now. It was especially bad for the first 100 miles or so after the soak, almost zero acceleration when flooring it. Now it only seems to do it when the engine is still cold.

    I'm hoping replacing the spark plugs may fix this. But there could be other reasons for the power loss.

    I had an extra can of Berryman's that I threw in the tank during the fill up after the soak. I also usually add 4 oz of Marvel Mystery Oil to the tank and that gives a noticeable power and MPG boost. I did not add it last time because of using the Berryman's instead.

    Going to see how changing the spark plugs affect power before going back to my MMO routine.

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    #10 TheLastMojojomo, Jan 7, 2021
    Last edited: Jan 7, 2021
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  11. TheLastMojojomo

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    Just wanted to post an update.

    My early success may have been premature.

    I'm just over 600 miles now and the dipstick is between an ⅛ and ¼ of an inch down from the top dot so there is definitely still some oil burn.

    Will try to update as I drive more miles.

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  12. SFO

    SFO Senior Member

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    Did the power return?
    Likely that you've put another 600 or 700 on, how is the oil consumption?
     
  13. TheLastMojojomo

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    Yes the power returned but I had to do a 12v disconnect to stop the acceleration weirdness completely...

    Unfortunately, the consumption appears to be the same. I'm roughly a ½ qt. Down. I have put over a 1,000 miles on this OCI but haven't driven it in almost a month now because I have an 04 CR-V for winter. My percieved success was premature. The oil does seem lighter though. It seems like it's darkening slower than before but can't be certain. I think I'm going to just have to accept I have an oil burner likely just from wear but will update in the future if I find something that works.

    My very first oil change I did on my Prius I put 0W-20 Mobil one in and the oil burned in a few hundred miles to the point of the Oil Pressure warning coming on. This was just after buying the car and it's burnt oil ever since then. This was at roughly 80k mi.

    I didn't know much about car maintenance then, that was the first time I did any sort of work on my car. If I would have had a little more sense like I do now I may have been able to prevent or greatly lessen the amount of oil burning that now occurs. The only reason I used 0W-20 the first time was because someone on this forum recommended for better MPGS.

    On a different note, I did my 2nd oil change on my 04 CR-V since ownership with Mobil One synthetic in fall of 2020 switching from conventional. It burnt a over a quart of oil in under 150 miles when before it previously burnt nothing. It continued to burn oil at a high rate throughout that OCI.

    I switched between topping it off with the Mobil One synthetic and some conventional I had left over. Whenever I topped off with conventional the burning would slow and when I'd add Mobil One it would speed up. I was nervous I had just created a second oil burner.

    Then on my most recent (3rd) oil change I switched to SuperTech 0W-20 and haven't burnt a drop in over a thousand miles.

    Makes me suspicious of Mobil One potentially being the reason my Prius now irreversibly burns oil. I used Mobil One in my Prius till 160k because it was supposed to be "the best".

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  14. edthefox5

    edthefox5 Senior Member

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    If your burning oil why are you using 20 weight oil?
     
  15. Mendel Leisk

    Mendel Leisk Sand Pounder

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    A “high mileage” oil might help. They have additives that swell seals. Once you start with such oil it’s best to stick with them; they’re last ditch remedy for clapped engines.
     
  16. TheLastMojojomo

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    I'm not using 20 weight in my Prius anymore. I only used it on the first oil change I ever did at 80k just after I bought the car. I've used 5w-30 now on every change since then.

    The 2nd part of the above post was talking about oil consumption in my CR-V with Mobil One 0W-20 and no consumption with SuperTech 0W-20.

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  17. TheLastMojojomo

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    Wanted to update this and say I believe the Berryman B-12 Piston Soak did actually cure my oil burning.

    My oil level has settled at just above the halfway point on the dipstick for the past 2,000+ miles.

    I am about 4,300 miles into this oil change interval.

    I think things were just readjusting with the rings after the B-12 dissolved all the carbon.

    The oil has also continued to stay a lighter tan color this whole time rather than quickly transitioning to a brownish black like in previous oil changes.

    B-12 and it's high energy solvents are the real deal!

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  18. TheLastMojojomo

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    Just wanted to update this again and say I'm 100% positive my oil consumption is cured but with a hiccup.

    Right after the last post I topped off my oil with the little bit of SuperTech 5w-30 I had left and Pennzoil Platinum 5w-30. Predominantly topping up with the Pennzoil Platinum.

    It started consuming oil again. The oil got darker and consumed oil down to the point of where I began the top up with the Pennzoil over the next 1,000ish miles.

    After the Pennzoil Platinum burned off the oil began to turn lighter again (weird I know) and the ICE stopped consuming oil again.

    I topped up with SuperTech 0w-20 full synthetic around 1,500ish miles ago and haven't burnt a drop more. The oil is also still a lighter golden color.

    I'm now over 8,000 miles on this OCI and plan on changing it soon.

    Moral of the story... don't use PP full synthetic in a Prius.

    On a side note I also did the Piston Soak on my CR-V but only a one hour version as I was under time constraints.

    I'm over 2,000 miles into this OCI with SuperTech 0w-20 Full Synthetic on my CR-V and I believe my oil consumption is cured for it as well.

    Oil has stayed lighter in color and has stopped consuming at above halfway on the dipstick after initial consumption. To early to tell for sure though.

    B-12 piston soaks are the answer to carboned up piston rings/drain back holes that cause oil consumption.

    Seafoam, MMO, and others aren't good enough. You need straight solvents to truly rid the rings/holes of baked on carbon.



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