2011 Prius Valve Cover Photos

[CR94]

Originally Posted by JHZR2
... the engine very rapidly transitions from high(ish) continuous power to full off, to back on again. That can create al sorts of challenges with unburned fuel, heat soak, etc. If a car takes 60hp to cruise at 60 mph, then the engine is routinely going from 50% load in my car (66% for the prius) to not only zero load but off (air flow through the engine removes a lot of heat and now the engine isn't pumping air), then back on, sometimes in a matter of seconds. ....
Some plausible points there, but your assumption about the 60 hp and 50% and 66% loads at 60 mph is greatly exaggerated, unless you're thinking of towing or climbing. According to Toyota, a 2nd or 3rd-generation Prius needs only about 31 hp to cruise at 120 km/hr (74.6 mph) on level road. Your Accord isn't much different. On most Toyota and Ford hybrids, the engine doesn't stop rotating when the car is coasting above certain speeds, although fuel is cut off. (Not sure about your Honda in that regard)

 

[Trav]

Originally Posted by ekpolk
Originally Posted by Trav
Originally Posted by StevieC
Raidin, it's because of the "fear thin low HTHS" crowd here...


When 0w20 was first introduced it was sold in Germany at the Toyota dealers as an oil especially for hybrids, so no surprise here. It makes sense though, a small liquid cooled engine used in low performance application with less than a 100% duty cycle, its perfect for that use.

0w-20 is recommended for, and doesn't seem to be causing problems in, Toyota's 5.7L V-8 engine. . .


You have to consider the surface diameter of the main and rod bearings, oil pump cam bearings, crankshaft surface finish, etc. Some engines are better suited to using it than others, try it in an engine with gear oil pump and narrow saddles and you may be looking for a new engine right quick.
High RPM use, timing chains, turbo and fuel dilution also play a role in if lower viscosity oils are suitable. Take CAFE out of the equation and look at how the engine is built and you will have a much better idea what oil will work best in it.

 

[Shannow]

Originally Posted by StevieC
Look at all that carnage from a 20wt. My god man you should switch to a 0w40 immediately.

Originally Posted by StevieC
Carnage in the sense that we see the top end and it doesn't look like the cam lobes are excessively wearing and the chain looks good as well. Yes it's clean but that wasn't what I was getting at.


Originally Posted by StevieC
Raidin, it's because of the "fear thin low HTHS" crowd here...


Originally Posted by StevieC
I explained in multiple threads why. It's not because I fear 20wt's like the "Thick is in" crowd.


Troll much ???

 

[StevieC]

Originally Posted by caprice_2nv
I like that description of oil grades. Lol

 

[StevieC]

Originally Posted by Shannow
Originally Posted by StevieC
Look at all that carnage from a 20wt. My god man you should switch to a 0w40 immediately.

Originally Posted by StevieC
Carnage in the sense that we see the top end and it doesn't look like the cam lobes are excessively wearing and the chain looks good as well. Yes it's clean but that wasn't what I was getting at.


Originally Posted by StevieC
Raidin, it's because of the "fear thin low HTHS" crowd here...


Originally Posted by StevieC
I explained in multiple threads why. It's not because I fear 20wt's like the "Thick is in" crowd.


Troll much ???



Can't take the heat huh?

 

[Gokhan]

Originally Posted by 2015_PSD
Originally Posted by Gokhan
Originally Posted by ekpolk
Originally Posted by Gokhan
. . .Well, you don't even seem to have posted your Mobil 1 Extended Performance 0w20 used oil analysis. You mentioned you would run it considerably longer and your iron was already rising between your used oil analysis; so, whatever you saw probably didn't mean much.

https://www.bobistheoilguy.com/foru...78641/2010_FX4_%7C_M1_AFE_0W-20_%7C_15,1
Easy guys. Just got off the monthly mods conference call. There is an anomalous setting in the used oil analysis sections. You may need to drop down to the bottom of the page, and reset the "Show From Previous" window from three months to " all threads". If you don't, you'll only be searching three months worth. Wayne will be getting this fixed shortly. Apologies for the inconvenience.
Thanks, that helps.

This is his only and last used oil analysis with Mobil 1 Extended Performance 0w20, after which he sold his truck.

https://www.bobistheoilguy.com/foru...78641/2010_FX4_%7C_M1_AFE_0W-20_%7C_15,1

It's very similar to his previous used oil analysis with Mobil 1 Advanced Fuel Economy 0W-20, despite running well over 15,000 mi this time. The only difference is the higher TAN but that can mean a lot of things, such as having exceeded the oil's life. There is no reason to expect the AFE to do any better in similar conditions, given that it has an inferior base oil and lighter additive package.
Really? Well, first of all, there is not a single used oil analysis of EP in the link that was posted, so once again you are making assumptions as you tend to do. Next, iron always tracks higher as mileage increases on an OCI, so not sure what you are attempting to state by saying it was rising--it can do nothing BUT rise and 20-22PPM of Fe for a 15-18K mile run is fairly trivial, when noting there are plenty of used oil analysis that have as much or more at far less miles. Lastly, considering that AFE did JUST AS WELL as EP pokes holes in your frequently stated baloney about inferior base oils--seriously man, your bovine scatology runs deep on this board. Here is the full list of used oil analysis for the truck -->2010 Ford FX4 used oil analysis. Do tell us how EP was "better" and how AFE is inferior in my use case and try not to bore us to point of wanting to stick a pen in our eyes by posting a dissertation of convoluted nothing.

First, calm down. Those two Mercedeses you are driving seem to give you some cyber rage if not road rage.

Second, I did find your EP used oil analysis and posted it in the second link.

Third, here is what you had said:

Originally Posted by 2015_PSD
Originally Posted by ekpolk
And, to get back squarely on topic, the OP's pictures just cemented my decision to switch from the AFE 0w-20 to the EP on my new car. I don't think that the AFE will do any harm, but this is essentially the same engine I have, and I like what I see here!
Unless you are going to run the EP much, much longer than the AFE you will see ZERO difference except your wallet being lighter. I ran Mobil 1 Advanced Fuel Economy 0w20 and 0W-20 EP in my 2010 FX4 for up to 18K miles and the AFE performed better (via used oil analysis results) than the EP did. YMMV.

You said "AFE performed better (via used oil analysis results) than the EP did." I was curious about that and looked for and found your used oil analysis. It turned out to be a false claim just as I thought. That's all.

 

[UNC151]

Originally Posted by Gokhan
Originally Posted by 2015_PSD
Thanks, that helps. This is his only and last used oil analysis with Mobil 1 Extended Performance 0w20, after which he sold his truck. https://www.bobistheoilguy.com/foru...78641/2010_FX4_%7C_M1_AFE_0W-20_%7C_15,1 It's very similar to his previous used oil analysis with Mobil 1 Advanced Fuel Economy 0W-20, despite running well over 15,000 mi this time. The only difference is the higher TAN but that can mean a lot of things, such as having exceeded the oil's life. There is no reason to expect the AFE to do any better in similar conditions, given that it has an inferior base oil and lighter additive package.
Really? Well, first of all, there is not a single used oil analysis of EP in the link that was posted, so once again you are making assumptions as you tend to do. Next, iron always tracks higher as mileage increases on an OCI, so not sure what you are attempting to state by saying it was rising--it can do nothing BUT rise and 20-22PPM of Fe for a 15-18K mile run is fairly trivial, when noting there are plenty of used oil analysis that have as much or more at far less miles. Lastly, considering that AFE did JUST AS WELL as EP pokes holes in your frequently stated baloney about inferior base oils--seriously man, your bovine scatology runs deep on this board. Here is the full list of used oil analysis for the truck -->2010 Ford FX4 used oil analysis. Do tell us how EP was "better" and how AFE is inferior in my use case and try not to bore us to point of wanting to stick a pen in our eyes by posting a dissertation of convoluted nothing.

Originally Posted by Gokhan
First, calm down. Those two Mercedeses you are driving seem to give you some cyber rage if not road rage.
I have no cyber or road range--that is laughable. What I do have is a low tolerance for idiots or those self-proclaimed experts who hit high on my bovine scatology meter. Most of what you post fits into one or more of those categories and should be called out on a regular basis. Performed any division by color lately?

Originally Posted by Gokhan
Second, I did find your EP used oil analysis and posted it in the second link.
No, you did not. If you look at the link that I posted, you will see the EP used oil analysis is used oil analysis #21 performed in July of 2015, then link you posted only goes up to #20 which was an AFE used oil analysis perform in August of 2014. So once AGAIN you are wrong and you are making assumptions. You do not have the facts (as usual) and you are comparing two AFE used oil analysis and not an EP and AFE used oil analysis.

Originally Posted by Gokhan
Third, here is what you had said:
Originally Posted by 2015_PSD
Unless you are going to run the EP much, much longer than the AFE you will see ZERO difference except your wallet being lighter. I ran Mobil 1 Advanced Fuel Economy 0w20 and 0W-20 EP in my 2010 FX4 for up to 18K miles and the AFE performed better (via used oil analysis results) than the EP did. YMMV.
You said "AFE performed better (via used oil analysis results) than the EP did." I was curious about that and looked for and found your used oil analysis. It turned out to be a false claim just as I thought. That's all
False claims? Really? Look at the used oil analysis in this link 2010 Ford FX4 used oil analysis. Please tell all of us how much better EP performed versus AFE. Then tell us how you determined that AFE has an inferior base oil and lighter additive package. I will wait...

 

[Gokhan]

Originally Posted by 2015_PSD
False claims? Really? Look at the used oil analysis in this link 2010 Ford FX4 used oil analysis. Please tell all of us how much better EP performed versus AFE. Then tell us how you determined that AFE has an inferior base oil and lighter additive package. I will wait...

Mobil 1 Extended Performance 0w20 has a better base oil than Mobil 1 Advanced Fuel Economy 0W-20 according to the MSDSs -- about twice the PAO. It also has a tad bit stronger additive package according to the VOAs/used oil analysis. Therefore, these are facts that I stand by.

I have never said that Mobil 1 Extended Performance 0w20 would do better than AFE 0W-20 in the used oil analysis. In fact, I have never said that any of them would do better than any other oil, including a cheap conventional 5W-20. You're imagining things I never said. My exact wordings and only wordings were "There is no reason to expect the AFE to do any better in similar conditions, given that it has an inferior base oil and lighter additive package."

Your exact wordings were "AFE performed better (via used oil analysis results) than the EP did." I expected this statement to be false; I looked for your used oil analysis and found them, and it turned out to be false as I expected. Rather than acknowledging it, you come back and claim that I made a statement that I actually never made. How do you take one's statement "I don't expect AFE to do better than EP" and turn it into "I expect AFE to do worse than EP." These are logically entirely different statements and I don't know why I need to explain something as simple as this.

 

[Garak]

Originally Posted by Gokhan
Mobil 1 Extended Performance 0w20 has a better base oil than Mobil 1 Advanced Fuel Economy 0W-20 according to the MSDSs -- about twice the PAO.

However, we really don't know that, given the way MSDSs work.

 

[UNC151]

Originally Posted by Gokhan
Your exact wordings were "AFE performed better (via used oil analysis results) than the EP did." I expected this statement to be false; I looked for your used oil analysis and found them, and it turned out to be false as I expected.
Until I posted the used oil analysis results, you were comparing used oil analysis of AFE to themselves as I explained in the last post, so claiming my statement to be false is based on what? Supposition?

Originally Posted by Gokhan
Rather than acknowledging it, you come back and claim that I made a statement that I actually never made. How do you take one's statement "I don't expect AFE to do better than EP" and turn it into "I expect AFE to do worse than EP." These are logically entirely different statements and I don't know why I need to explain something as simple as this.
There is nothing here I need to acknowledge other than you clearly have an issue determining the difference between an AFE and EP used oil analysis--especially when you never had the EP used oil analysis until I posted it. If you are not expecting AFE to do better, what are you expecting it to do? The same? With all of your comments about "inferior base oil" and "lighter additive packs" versus those of EP, you can hardly change your stance to say you did not mean that AFE would perform worse than EP or can you?

 

[Gokhan]

Originally Posted by 2015_PSD
Originally Posted by Gokhan
Your exact wordings were "AFE performed better (via used oil analysis results) than the EP did." I expected this statement to be false; I looked for your used oil analysis and found them, and it turned out to be false as I expected.
Until I posted the used oil analysis results, you were comparing used oil analysis of AFE to themselves as I explained in the last post, so claiming my statement to be false is based on what? Supposition?
Originally Posted by Gokhan
Rather than acknowledging it, you come back and claim that I made a statement that I actually never made. How do you take one's statement "I don't expect AFE to do better than EP" and turn it into "I expect AFE to do worse than EP." These are logically entirely different statements and I don't know why I need to explain something as simple as this.
There is nothing here I need to acknowledge other than you clearly have an issue determining the difference between an AFE and EP used oil analysis--especially when you never had the EP used oil analysis until I posted it. If you are not expecting AFE to do better, what are you expecting it to do? The same? With all of your comments about "inferior base oil" and "lighter additive packs" versus those of EP, you can hardly change your stance to say you did not mean that AFE would perform worse than EP or can you?

OK, I've now figured it out. We're both right.

I did find your EP used oil analysis but posted the wrong link:

https://www.bobistheoilguy.com/foru...011-prius-valve-cover-photos#Post5027098

And these are my exact wordings from that post. I used the word "similar:"

"It's very similar to his previous used oil analysis with Mobil 1 Advanced Fuel Economy 0W-20, despite running well over 15,000 mi this time. The only difference is the higher TAN but that can mean a lot of things, such as having exceeded the oil's life. There is no reason to expect the AFE to do any better in similar conditions, given that it has an inferior base oil and lighter additive package."

Note that I am referring to the TAN. I also knew that it was your only EP OCI and you sold your truck immediately after that -- "This is his only and last used oil analysis with Mobil 1 Extended Performance 0w20, after which he sold his truck." I wouldn't have this information if I didn't see your actual EP used oil analysis, would I?

Your post linking your EP used oil analysis came five posts after my post:

https://www.bobistheoilguy.com/foru...011-prius-valve-cover-photos#Post5027278

Now, I understand the source of the confusion -- I thought I had posted the link you posted but I had actually posted the old link again by mistake.

 

[MPDano]

Originally Posted by The Critic
Current odometer reading: 184,997 miles.

For the first 90k, I followed the Toyota recommendation of 10K drains using 0w-20 full synthetic.

From 90k - present, I have been replacing the oil and filter every 5K miles.

About 75% of the time I used Mobil 1 Extended Performance 0w20. The rest of the time has been various other brands (TGMO, Pennzoil, ServicePro, ACDelco).

The engine valve cover and timing cover were removed in preparation for cylinder head removal. The headgasket failed last week and is dumping coolant into cyl 2.

Hello,

Was wondering if you just replaced the gaskets or did you have your head resurfaced?

Thanks,
Leo

 

[The Critic]

Originally Posted by MPDano
Originally Posted by The Critic
Current odometer reading: 184,997 miles.

For the first 90k, I followed the Toyota recommendation of 10K drains using 0w-20 full synthetic.

From 90k - present, I have been replacing the oil and filter every 5K miles.

About 75% of the time I used Mobil 1 Extended Performance 0w20. The rest of the time has been various other brands (TGMO, Pennzoil, ServicePro, ACDelco).

The engine valve cover and timing cover were removed in preparation for cylinder head removal. The headgasket failed last week and is dumping coolant into cyl 2.

Hello,

Was wondering if you just replaced the gaskets or did you have your head resurfaced?

Thanks,
Leo

Leo, the cyl head was resurfaced and new valve stem seals were installed. Engine is still running great at 207K (22k miles since the repair).

 

[DirectRejection]

Thanks for the bump and the report from OP.
This is the world I live in.
I am hearing from numerous other delivery drivers about HG failures in Prius Gen3 and Lexus CT200h.
My 2019 Lexus UX 250h F-Sport has the hybridized 2019+ HB/2020+ Corolla engine.
I expect excellent results with many hundreds of thousands of miles.
Any feedback or further reports are appreciated, especially piston ring cleanliness, and oil comsumption after the OCI on Valvoline Restore 10W30..

 

[The Critic]

Originally Posted by Direct_Rejection
Thanks for the bump and the report from OP.
This is the world I live in.
I am hearing from numerous other delivery drivers about HG failures in Prius Gen3 and Lexus CT200h.
My 2019 Lexus UX 250h F-Sport has the hybridized 2019+ HB/2020+ Corolla engine.
I expect excellent results with many hundreds of thousands of miles.
Any feedback or further reports are appreciated, especially piston ring cleanliness, and oil comsumption after the OCI on Valvoline Restore 10W30..

My engine has never consumed any oil so the Valvoline Premium Blue Restore was only used for maintenance purposes.

 

[MPDano]

Originally Posted by The Critic
Originally Posted by MPDano
Originally Posted by The Critic
Current odometer reading: 184,997 miles.

For the first 90k, I followed the Toyota recommendation of 10K drains using 0w-20 full synthetic.

From 90k - present, I have been replacing the oil and filter every 5K miles.

About 75% of the time I used Mobil 1 Extended Performance 0w20. The rest of the time has been various other brands (TGMO, Pennzoil, ServicePro, ACDelco).

The engine valve cover and timing cover were removed in preparation for cylinder head removal. The headgasket failed last week and is dumping coolant into cyl 2.

Hello,

Was wondering if you just replaced the gaskets or did you have your head resurfaced?

Thanks,
Leo

Leo, the cyl head was resurfaced and new valve stem seals were installed. Engine is still running great at 207K (22k miles since the repair).


Thanks for the reply sir.