Lets put 5W-40 in everything...

[NA4U]

•VVT won’t work right.
•Cylinder deactivation won’t work right.
•Bearings will starve because oil passages are too small
•Engine will be sluggish
•Most importantly the electric oil pump will fail because the “tolerances” are too tight voiding the US factory warranty.

Yay! Finally somebody answering the question! Thank you

 

[kschachn]

Vehicles would be fine, but gas consumption could increase. I have observed about 10% decrease in MPG moving from PUP XW20 to Motul 300v 5w40

That’s way beyond what the physics of the grade would do.

 

[kschachn]

•VVT won’t work right.
•Cylinder deactivation won’t work right.
•Bearings will starve because oil passages are too small
•Engine will be sluggish
•Most importantly the electric oil pump will fail because the “tolerances” are too tight voiding the US factory warranty.

I thought it would shear off the drive gear?

Don’t forget that the ECU gets recalibrated when the vehicle drives into Mexico.

 

[4wd]

This is always the slam against the thicker is better crowd, but if you actually listen to them they simply advocate a HTHS >3.5, with some excess being beneficial to buffer shear. Most quality 30 weights give you that, but since you never really know for how long a 40 weight seems to be the best option especially for longer OCI.

Except how the “label” people stuff goes !
So I run 5W-30 in my zerodubyatwenny mill - and THICKY
HTHS ? Every vehicle we have can live with 3.2 just fine …

 

[Pablo]

I'm running 10W-30 and 5W-40. I don't think I will go 40 again in either.

 

[Hohn]

PSST-- Dr Rudnick was a "thickie."

His work basically characterizes HTHS below 3.5 as unacceptable and HTHS of 4.2 as the real threshold of wear mitigation.

It's probably not coincidence that the euro specs have HTHS >3.5 as a min spec.

 

[Hohn]

It kind of looks like for 0 W 40, you are only a hair away from using one oil everywhere as the OP posits.

While I do not subscribe to "one oil", if I did, it would certainly be a 0w-40. And for sheer WalMart convenience, it would likely be Mobil 1 0w-40 FS. This is as close to a true universal oil as exists today, IMO. Works fine in heinous North Dakota short trip commutes, but can handle Arizona heat.

 

[cptbarkey]

I read somewhere on here someone saying to just put 5W-40 in everything. Hmmm....I thought. Would it go well in lets say a Toyota Camry? Would it be right for all vehicles or at least most? As I walk up the street over here and look at all the vehicles Im resolved to the fact that yes its probably a good idea to put 5W-40 in at least most vehicles especially seeing that some of these cars are lasting 10 years or more. There is a good selection over here at the Walmart with Mobil 1, Castrol, Valvoline and the budget-minded mans Quaker State at $23 per bottle.

So what could go wrong if we sat here slinging around 5W-40 resolved to putting it in everything?

I dont subscribe to such notions. I do what I want and lots of self research, and don't bother asking the community unless I do happen to have specific questions of course.

 

[Dr_Dr3i]

PSST-- Dr Rudnick was a "thickie."

His work basically characterizes HTHS below 3.5 as unacceptable and HTHS of 4.2 as the real threshold of wear mitigation.

It's probably not coincidence that the euro specs have HTHS >3.5 as a min spec.

Delo XSP 5w40 it is then.

 

[buster]

PSST-- Dr Rudnick was a "thickie."

His work basically characterizes HTHS below 3.5 as unacceptable and HTHS of 4.2 as the real threshold of wear mitigation.

It's probably not coincidence that the euro specs have HTHS >3.5 as a min spec.

He's a million times more knowledgeable than I am but I'm not sure such generalizations are always accurate. Ironically so many engines today are lasting longer than ever but the real issue isn't viscosity - it's GDI and extended drains on oils that can't keep rings clean.

Lingenfelter uses AMSOIL Signature Series, all of which have HT/HS <3.5 in some of their high-end builds. They found those oils to outperform oils with higher HT/HS. So I think it's really a bit more nuanced because it depends on the overall build quality of the oil.

 

[Pablo]

He's a million times more knowledgeable than I am but I'm not sure such generalizations are always accurate. Ironically so many engines today are lasting longer than ever but the real issue isn't viscosity - it's GDI and extended drains on oils that can't keep rings clean.

Lingenfelter uses AMSOIL Signature Series, all of which have HT/HS <3.5 in some of their high-end builds. They found those oils to outperform oils with higher HT/HS. So I think it's really a bit more nuanced because it depends on the overall build quality of the oil.

The dependence on one or two parameters of an oil probably won’t lead to harm, but are not necessarily a predictable path to optimization.

 

[Hohn]

He's a million times more knowledgeable than I am but I'm not sure such generalizations are always accurate. Ironically so many engines today are lasting longer than ever but the real issue isn't viscosity - it's GDI and extended drains on oils that can't keep rings clean.

Lingenfelter uses AMSOIL Signature Series, all of which have HT/HS <3.5 in some of their high-end builds. They found those oils to outperform oils with higher HT/HS. So I think it's really a bit more nuanced because it depends on the overall build quality of the oil.

Maximum "performance" doesn't always mean minimum wear. Someone like Lingenfelter is almost certainly not willing to give up 10hp oil oil parastics to have an engine last twice as long.

People aren't putting 100k on Lingenfelters.

 

[tcp71]

two oils for my fleet. 0w40 for the turbos and 0w30 for the rest. The subaru is an outlier as it gets an oil change every two years...after 2k miles in those years. temps range from -35C to +35C.

 

[mt23]

PSST-- Dr Rudnick was a "thickie."

His work basically characterizes HTHS below 3.5 as unacceptable and HTHS of 4.2 as the real threshold of wear mitigation.

It's probably not coincidence that the euro specs have HTHS >3.5 as a min spec.

This keeps me sleeping well at night with HPL 5w40 PCEO in most of the vehicles in the driveway and HTHS 4.248 cP

 

[ARCOgraphite]

Silly thread.

"There is nothing to fear but shear itself!"

 

[buster]

Maximum "performance" doesn't always mean minimum wear. Someone like Lingenfelter is almost certainly not willing to give up 10hp oil oil parastics to have an engine last twice as long.

People aren't putting 100k on Lingenfelters.

I see what you're saying. I still think durability is very important to them.

You could have an oil with a HT/HS of 3.2 that has better wear performance than a poorly formulated oil that has a HT/HS of 3.8. So to me it comes down the entire formulation.

All things being equal, then I suppose HT/HS 3.5> is better....also engine dependent.

 

[Astro14]

Yay! Finally somebody answering the question! Thank you

You do realize that was sarcasm, don’t you?

None of the things he said were true - it was a compilation of myths about thicker oil.

 

[Astro14]

Silly thread.

"There is nothing to fear but shear itself!"

Agreed. It is a case of a Noob thinking that their idea is new - not realizing that this topic has been discussed hundreds of times before.

 

[ARCOgraphite]

You do realize that was sarcasm, don’t you?

None of the things he said were true - it was a compilation of myths about thicker oil.

Nope. VVT phaser position is an issue when VVT isn't tightly monitored and controlled.
Easily noticeable on certain generations and marques.

 

[Astro14]

Nope. VVT phaser position is an issue when VVT isn't tightly monitored and controlled.
Easily noticeable on certain generations and marques.

60C 0W20 is far thicker than 100C 5W40, so, why don’t the phasers have a problem when the oil is still warming up?

And why don’t I have phaser issues running a “gasp” 0W30 in a truck in which 0W20 is specified?