0w-10w BruceAlmighty blend

[Gary Allan]

Well, the minivan guinea pig is stolen ..and that leaves the rest of the extended fleet to take the plunge. Since the youngsters are getting hard to wrangle in for service ..or just take too much time to accumulate mileage, I've decided to go REALLY radical and put this thin stuff in my 2.5 jeep engine.

Now I know what you're thinking, has he lost all his marbles or all his marbles minus one?? Well, seeing that this is a tractor engine with a timing chain that has responded well to heavier weights in the past ..and will shear your VII clean off, you have to ask yourself, do I feel lucky??

Super Duty 0w/10w

Vis 100 6.8
Vis 40 33.3
VI 160
ZN 1801
Moly 1801
P 1703
CA 3297
FE 3

TBN 9.26

Although this breaches the 20 weight visc range, it has too low a HTHS to be called a 0w-20. So in adapted industry nomenclature, it would probably have to be called 0w-10w. Bruce used a dash too much green polymer ...but it doesn't smell like gummy bears.

I'm going get Terry's take on this run. I wanted to involve him in the original Bruceblend® ..but a spot UOA showed 2400ppm of Cu (my exchangers were all copper - 3 of them) and Bruce wanted to reformulate. The rest of the numbers were below noise...but since we weren't staying with that original formula, I decided to skip Terry at that time. I had the new stuff in the minivan when it was stolen.

 

[G-MAN]

Is this a PAO or Group III based oil?

 

[jmsbntz]

So what is the HT/HS and how many miles on the jeep?

 

[jmsbntz]

Also did you do a UOA on what WAS in the jeep for the sake of comparison?

 

[Gary Allan]

It's a Group III base stock. I think it's a 5.x CST base stock with a few oz of additives. Bruce will hopefully chime in.

The older blend, which was just below the 20 visc range, had a computer modeled HTHS of 2.2, IIRC.

The engine has 63,600 miles on it.

The current UOA, its second, is being sent to Terry for interpretation. I's had a steady diet of Rotella T synthetic 5w-40 for a few years ..and 5w-40 for most of its life. Agip PC 5w-40, Delvac 1, and the original PZ 5w-40 have been in there. Inspections via the oil fill port show a spotless interior. Brand new looking.


Oil pressure is reduced with this oil, but not all that much. I'd typically be at the limit when starting with RTS ..and still go there now with the 0w-10w ..but it retreats to 40psi after a bit ..and RTS never went below about 50+/-. The engine is exchanged, so oil temp never gets too much above or below 200F.

 

[buster]

Very cool. I bet it does well. I'd buy oils from bruce anyday. (hint)

How does the engine feel with this oil? How long until you get some mileage on it?

 

[Gary Allan]

I've only got a few miles on the oil ..so impressions are limited. Bruce IS a MixMeister of distinction. I'm sure that my cold starting situation will improve. No noise or anything, but the starter would "wooah-wooah" for the 2 or 3 rotations it took to start.

This engine has shown high Fe in UOA. It's been determined that there were fuel issues involved ..but it's uncertain yet if that has been cleaned/repaired out ..or if it's inherent to the fuel management system under that type of service.

The main thing that will spell the visc factor here is that this engine has had virtually no Pb in UOA. So as long as there's no disrupting reactions involved, that might provide some compass in the viewing.

 

[Camu Mahubah]

"..but a spot UOA showed 2400ppm of Cu (my exchangers were all copper - 3 of them)"

This might be a dumb question. Exchangers=oil coolers?
If so, what would cause them to leach Cu?

 

[Gary Allan]

Yes, oil coolers. 2 Eaton Fuller towmotor trans coolers and one Hayden radiator cooler. Lots of copper.


Phos and moly. I never got to see if there was pristine copper or a black coating. He was so alarmed that he gave me a call (very nice guy). I wasn't upset since I had a plausible explanation and supporting evidence that it wasn't from other surfaces. If it was some copper underlay on the bearings, I would have expected to see PB in the 100's of PPM along side it. Fe, Al, etc. were all like in the >5ppm for 3k miles ..and the thing wasn't rumbling like a loose goose. In fact .there wasn't a peep out of it. No hot idle HLA noise ..nuttin'

Bruce mentioned that he could have included (IIRC) copper corrosion (?) inhibitors if he'd known that I had so much raw copper involved.

 

[G-MAN]

Quote:

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It's a Group III base stock. I think it's a 5.x CST base stock with a few oz of additives. Bruce will hopefully chime in.

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So no VI improvers?

 

[Camu Mahubah]

Quote:

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Bruce used a dash too much green polymer ...but it doesn't smell like gummy bears.

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These must be the VII's?

 

[Gary Allan]

No, I don't think there's room for VIIs. From what I gathered, any visc increase is due to the additives that come (I'm assuming here) in solution in their own carrier oil.

 

[Cutehumor]

how much does bruce charge for a custom blend?

 

[bruce381]

gary I forgot whats in there LOL but will look it up on moanday send me a sample at 3-5K may need virgin to since I do not remember if i kept one.
bruce

 

[bruce381]

Duh? you have the VOA so I guess I did run it, also this one has a HTHS of at or > 2.6
bruce

 

[jmsbntz]

Excellent a 0W10 with a 2.6 HTHS!
So a 5W25 with a 3.5 HTHS is possible yes?

 

[SargeGTO]

May I have your parts please

 

[Master ACiD]

sdo what happen to the minivan? is this the same one which you had plumbing pipes hoooked up to the engine?

 

[Gary Allan]

Quote:

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Duh? you have the VOA so I guess I did run it, also this one has a HTHS of at or > 2.6
bruce

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Well then ...I have to re-title it "super duty super thin 0w-20". With a 2.6 HTHS it qualifies as a 20 weight We're 1.2 CST into 20 range.

Here's something that may stir your memory..

"Gary I just realized that this last garys oil was is a 0w20 wt at what 6.8 vis, Oh well got too heavy on the GC type polymer I guess.
bruce

 

[oilyriser]

Does ring seal suffer when you start getting really thin? Would this be enough to offset or reduce the fuel economy gains from using a very thin oil?
Is there a VII out there that suffers no permanent v. loss after shear, but has a very large temporary loss of viscosity when under shear? I'm thinking an oil that's thick as far as sealing the rings goes, but becomes thin at the contact areas, to reduce drag.