Reason for lack of 10W-30 full synthetic ?

[SubieRubyRoo]

Amsoil SS 10w30 has a Noack of (4.1%) vs (6.7%) for the 5w30. Minimal difference.

Buster- cmon man! I know your phone has a calculator on it. 4.1 vs 6.7% Noack is a sixty-one percent reduction in evaporation at 150*C.

That’s the equivalent of saying 20 mpg is a “minimal difference” from 32mpg, which is the same % difference as your Noack example.

 

[GaryMX5]

I occasionally see it in "High mileage", but at least in my immediate area there has been none in most major brands.
I'm looking for the Penzoil platinum. I did see a small quantity of STP brand full synthetic at autozone in 10w30, either everyone is buying it or they are not stocking it.
So anything good or bad about the STP brand oil?

Just wish single weight full synthetic was available, because I am not using 5W anything in this vehicle.

Must not be looking very hard. My local walmart had Super tech and a half dozen high milage 10w30 oils. I'm guessing rural (small town) walmarts, farm and ranch stores would have lots of it as it's a favorite amongst farmers and ranchers.

 

[chris719]

Buster- cmon man! I know your phone has a calculator on it. 4.1 vs 6.7% Noack is a sixty-one percent reduction in evaporation at 150*C.

That’s the equivalent of saying 20 mpg is a “minimal difference” from 32mpg, which is the same % difference as your Noack example.

It’s not a very big absolute difference though. Nor is it probably impactful.

 

[SubieRubyRoo]

It’s not a very big absolute difference though.

If you made $1k per year and were offered a 61% raise, you’d turn it down because it wasn’t a very big absolute difference and keep taking the $1k salary?

 

[Gladiator007]

10w is for wimps, 20w for the win.

 

[buster]

I consider anything <10% good, so 4-7% is very good. But you're right it is a difference.

 

[chris719]

If you made $1k per year and were offered a 61% raise, you’d turn it down because it wasn’t a very big absolute difference and keep taking the $1k salary?

No, if I had $100 and someone was going to steal $6.7 dollars or $4.1 dollars from me I would barely give a **** either way. It is not a 61% raise on $1k or even $100.

If you tested 5 L of oil you’d lose about 100-130 more mL if you subjected the entire sump to the test.

 

[GaryMX5]

My 70 Barracuda and 75 vega called for 10w30. We moved to Milwaukee in 1977 and experienced our first winter there. **** it was cold! The cars had to stay outdoors as we lived in an apartment. We had all kinds of starting problems in the early morning. A gas station mechanic (they still had those back then) suggested a new fangled 5w30 wt oil (still mostly conventional oils back then). It solved a lot of our starting problems.

 

[barkingspider]

There’s plenty of 10w30 full syn and blends here at the Walmarts in SoCal

 

[Plumb Bob]

Say whut?!?

The formulators.

 

[chris719]

Say whut?!? It’s literally impossible for a winter rating to be arbitrary. And it can never “degrade” to a better rating. You can mix it with something that has a worse winter rating, but then, the overall can only get worse, not better! If you have a 10wXX oil and pour in some quantity of 0wXX, the resultant mix will still be a 10wXX oil, regardless of the base stock used…

What he means is that if you go to formulate a 30 grade with the best base stocks available you may just find you have a naturally high enough viscosity index to meet the 5W rating and if it does pass MRV and CCS at 5W limits you must label it 5W. Clearly this is possible with mPAO as HPL can make a no VII 3.5 HTHS 30 grade that is a 5W-30.

 

[Exhaustgases]

Again which is the higher cold start viscosity oil? 5W-30 or 10w30?
Unless I misunderstand it looks like some are saying 5w is sometimes thicker than 10w.
Not according to my study and the bot. Film strength is most important and only high viscosity offers that.
And why a more viscus base oil is just better, car manufactures don't care, mileage is the reason for their oil weight(viscosity) choice.

Then explain how a certain Noack, affects the lube effect and load carrying effect of bearings? Since it is tossed around like the most important quality. Yeah I know what it means.

 

[chris719]

And why a more viscus base oil is just better, car manufactures don't care, mileage is the reason for their oil weight(viscosity) choice.

If viscosity is all you care about why 10w30? Why not 10W-60 or 15W-50.

 

[Rmay635703]

If viscosity is all you care about why 10w30? Why not 10W-60 or 15W-50.

HD30 for the win

 

[Exhaustgases]

What he means is that if you go to formulate a 30 grade with the best base stocks available you may just find you have a naturally high enough viscosity index to meet the 5W rating and if it does pass MRV and CCS at 5W limits you must label it 5W. Clearly this is possible with mPAO as HPL can make a no VII 3.5 HTHS 30 grade that is a 5W-30.

Yeah ! just like that old bottle of Havoline 30 dad dumped in the old beaters back in the 60's.

 

[Plumb Bob]

Unless I misunderstand it looks like some are saying 5w is sometimes thicker than 10w.
Not according to my study and the bot.

HPL PCEO 5W-20 -- 8.80
HPL PCEO 10W-20 -- 8.62

HPL PCEO 5W-30 -- 10.72
HPL PCEO 10w30 -- 10.28

The horse has been beaten to death around here.
And that is not what I was saying.

 

[Exhaustgases]

If viscosity is all you care about why 10w30? Why not 10W-60 or 15W-50.

Because its the cold start vis that is important as well as film strength. But then SAE 60 works just great in the cold as I dumped it in airplanes back in the day, in winter time, Its a bit gooey for my puddle jumper though, and its not aircooled, nor does it go up and pull the power that the airplane engines did, my 5 or 10 minute trips just couldn't warm it up enough, like the planes had to do before take off.

 

[Exhaustgases]

HPL PCEO 5W-20 -- 8.80
HPL PCEO 10W-20 -- 8.62

HPL PCEO 5W-30 -- 10.72
HPL PCEO 10w30 -- 10.28

The horse has been beaten to death around here.
And that is not what I was saying.

All at 100C right. So what, different additives right, its their mixing style I suppose? Whats the cold film strength?

 

[Exhaustgases]

Sure close this if you wish. It has run its course.

 

[Jetronic]

It’s not a very big absolute difference though. Nor is it probably impactful.

If oil evap causes issues (like intake valves coking possibly, sticky throttle valves seem common enough aswell) then less evap will push that problem further out. 4.1% vs the 15% API limit means that problem could be suppressed up to 3x higher mile count, or "nothing to worry about" territory.