All You Guys That Think OEM Recommended 16 or 20 Weight...

[tolian21]

Are there also threads for these engines blowing up using factory recommended oil specs? I am sure you can find them if you dig hard enough….

 

[ChristianReske]

Just saying that i am very, very sceptical. Use the oil viscositiy that is recomended in the manual, maybe one step up to the next viscositiy grade, thats it.

 

[Ronin73]

Are there also threads for these engines blowing up using factory recommended oil specs?

Nope. And you won't find them because these engines will run hundred of thousands of miles on the factory recommended oil.

 

[Accent Abuser]

Honda S2000. The 9.000 RPM F20C engine: Owner manual calls for 10w-30.
The last two reports of damged engine in the german S2000 Forum had two things in Comonn:
Trying to reach top speed on the autobahn and both engiens where filled with a 5W-50 Oil "For better protection".

Co-Worker is 100% Alfa Romeo fan. When he was younger, he followed advice from friends and used 10w-60 in his Alfa Romeo instead of -40 as recommended in the manual, because "These are such sporty engines, constantly high reving.." The engine had a Bearing failure in short time.
Since this time, he uses the Viscosity that the manaul calls and the engines last.

In the german Liqui Moly forum was a thread that looks like trolling: One guy has owned one Opel and two Skoda (=VW) , theses engines where specd for - 40 Oils or thinner. He reported that he used 10w-60 Oils for better protection becasue the engiens where "Tuned" and that he used the cars on short trips around town. All three engines died from bearing failure in short time.

https://forum-liqui-moly.de/index.php/forum/motoroele/1242-motorschaeden

(Use Google translator)

So a 5w-20/30, which is much more easily forced out of the hydrodynamic wedge in the bearings, would have better protected the engine under extreme loads?

Does not compute....

 

[tolian21]

Nope. And you won't find them because these engines will run hundred of thousands of miles on the factory recommended oil.

Most people that use OEM spec oil drive normally and do not modify their cars. Did these people have any other modifications or taking their cars to the track? So you find couple posts, and that somehow supposed to make a statistically accurate study? I can go right now to one of those blogs and post a fake issue with OEM speced oil.

 

[BMW Dom]

Excellent technical post with good reasoning.

Probably best post so far. No point in posting anymore, I will never be able to top his post.

 

[ZeeOSix]

Honda S2000. The 9.000 RPM F20C engine: Owner manual calls for 10w-30.
The last two reports of damged engine in the german S2000 Forum had two things in Comonn:
Trying to reach top speed on the autobahn and both engiens where filled with a 5W-50 Oil "For better protection".

How many guys tried the same top speed runs using 5W-30?

 

[JavierH19]

2021 Toyota YarisCross Hybrid.
M15A-FXE.
1.5L 3Cylinder.
Dynamic Force.
FI/GDI Computer Controlled.
Oil Spec 0W8.

check out the post i made about the yaris hybrid. the owners manual states 0w-8 to 5w-30 and the 2020 prius states 0w-16 to 15w-40 but i didn't post it someone else did. Another guy put 20w-50 in and got immediate oil flow with the covers off so no its not goo that takes minutes to finally circulate like some sadly believe.

 

[BMW Dom]

check out the post i made about the yaris hybrid. the owners manual states 0w-8 to 5w-30 and the 2020 prius states 0w-16 to 15w-40 but i didn't post it someone else did. Another guy put 20w-50 in and got immediate oil flow with the covers off so no its not goo that takes minutes to finally circulate like some sadly believe.

To me, the RECOMMENDED viscosity is the thinnest viscosity suitable, while still providing adequate protection

 

[ChristianReske]

How many guys tried the same top speed runs using 5W-30?

The engine has no problems with racetreack use in the USA and germany with 30 or 40 viscosity oil.

 

[ChristianReske]

So a 5w-20/30, which is much more easily forced out of the hydrodynamic wedge in the bearings, would have better protected the engine under extreme loads?

Does not compute....

No. i dont have wrote this.
But using a 50 when the manual calls for 30 or a 60 when the manual calls for a 40 is to much risk, in my opinion.

 

[Jackson_Slugger]

Honda S2000. The 9.000 RPM F20C engine: Owner manual calls for 10w-30.
The last two reports of damged engine in the german S2000 Forum had two things in Comonn:
Trying to reach top speed on the autobahn and both engiens where filled with a 5W-50 Oil "For better protection".

Co-Worker is 100% Alfa Romeo fan. When he was younger, he followed advice from friends and used 10w-60 in his Alfa Romeo instead of -40 as recommended in the manual, because "These are such sporty engines, constantly high reving.." The engine had a Bearing failure in short time.
Since this time, he uses the Viscosity that the manaul calls and the engines last.

In the german Liqui Moly forum was a thread that looks like trolling: One guy has owned one Opel and two Skoda (=VW) , theses engines where specd for - 40 Oils or thinner. He reported that he used 10w-60 Oils for better protection becasue the engiens where "Tuned" and that he used the cars on short trips around town. All three engines died from bearing failure in short time.

https://forum-liqui-moly.de/index.php/forum/motoroele/1242-motorschaeden

(Use Google translator)

I could be wrong, but I think the S2000 also listed 5W-40 in the manual, at least in North America...

 

[ChristianReske]

I could be wrong, but I think the S2000 also listed 5W-40 in the manual, at least in North America...

Yes. But it is written in the manual that 5w-40 should be used only below -20°C / -4°F. 10w-30 should be used year round.
This is the most weird oil reccomendation ever written, i think.

 

[DirectRejection]

check out the post i made about the yaris hybrid. the owners manual states 0w-8 to 5w-30 and the 2020 prius states 0w-16 to 15w-40 but i didn't post it someone else did. Another guy put 20w-50 in and got immediate oil flow with the covers off so no its not goo that takes minutes to finally circulate like some sadly believe.

Thank you for the heads up.
I am indeed keenly aware of all that you mention.

Additionally, I have hundreds of thousands of miles of experience with 0W16.

 

[kschachn]

check out the post i made about the yaris hybrid. the owners manual states 0w-8 to 5w-30 and the 2020 prius states 0w-16 to 15w-40 but i didn't post it someone else did. Another guy put 20w-50 in and got immediate oil flow with the covers off so no its not goo that takes minutes to finally circulate like some sadly believe.

Of course not. Flow is largely irrelevant because if it pumps it flows.

 

[ZeeOSix]

Honda S2000. The 9.000 RPM F20C engine: Owner manual calls for 10w-30.
The last two reports of damged engine in the german S2000 Forum had two things in Comonn:
Trying to reach top speed on the autobahn and both engiens where filled with a 5W-50 Oil "For better protection".

Exactly what was the engine damage? Lots of things can go wrong with an engine running at WOT at top speed for miles. Plus, if the engines were modified and had modified tunes, it makes it even more likely something could go "boom".

 

[ZeeOSix]

Of course not. Flow is largely irrelevant because if it pumps it flows.

To add ... because: "positive displacement oil pump".

 

[Obi Wan Noobi]

Yes. But it is written in the manual that 5w-40 should be used only below -20°C / -4°F. 10w-30 should be used year round.
This is the most weird oil reccomendation ever written, i think.

Not really, check out a RAM 2500/3500 Cummins 6.7 oil recommendation.

 

[Accent Abuser]

To me, the RECOMMENDED viscosity is the thinnest viscosity suitable, while still providing adequate protection

I like your thinking. If you're beating the hell out of your engine (towing, high speed/rpm, driving aggressively in stop and go traffic like you stole the car, or doing any of the above especially in high heat) you should probably go thicker.

 

[Accent Abuser]

No. i dont have wrote this.
But using a 50 when the manual calls for 30 or a 60 when the manual calls for a 40 is to much risk, in my opinion.

I'd put a 60 in my car (during summer of course) if someone gave me some, and aside from horrible gas mileage I seriously doubt anything bad would come of it. Most 60s are what, 25cst at 100c? That's thinner than 5w-20 at 40c.