PM sent. $26 is a good deal. Not many locals on this board.

 

I wish I could hook you guys up like that but I guess not. Sorry.

 

Here's an oil analysis on Valvoline Premium Blue 5W-40. Down to a 30 weight before 3,680 miles. - 12.17 CST at 100 Deg C, the range of a 40 weight is 12.6-16.29.

 

That's odd Rich. Maybe there's just not enough miles on that engine? Click Here for my UOA at 265k & 270k miles from Blackstone (5k on each oil). Valvoline 15w-40 in the left column, Delo 15w-40 on the right. Is it normal for the synthetic to fall back quicker than the dino?

 

Pocket,

The hard part in your situation is Dual HPOP in a cold climate. So you are after a 5W-40 oil for better cold start performance but need the viscosity stability due to the ICP/Dual HPOP setup.

FWIW - More polymers are used to make a 5W-40 become a 40 weight at temperature than are used in a 15W-40 oil. Over time the high pressure & temps will break down these polymers and they will not recoil back to there original shape, thus the viscosity shear. The oils that have a high Viscosity index and have less of a difference beteen the two weights (5W-40 has a 35 point diff, and 15W-40 has a 25 point diff) tend to resist shearing better. In the specific situation you mentioned I would also look at the stable pour point of the oil. There are some 15W-40 synthetic blends that have a pour point of only 5-8 degrees above a 5W-40, but not as good of a CCS score (Standard Test Method for Apparent Viscosity of Engine Oils Between -5 and -35°C). But some of this data can be difficult to find.

I am curious how Rotella's new T-5 10W-40 Diesel Oil will perform in a PSD, but I have not seen any used oil analysis reports yet.

 

Nice report Chris....Delo 400 is a very good oil for the 7.3L.

It all depends on the application when it comes to shearing oil. The 6.0L's(3,500+ ICP), a 7.3L's running high ICP programs and/or dual HPOP are very tough on oil and can shear quicker than in other applications. On the average they tend to shear down to a 30 weight before 4-5K, some sooner. As I said above the 5W-40's have more polymers and they tend to shear quicker in these applications than a 15W-40 synthetic blend. I have only seen a few UOA reports on a 6.0L go over 5K and not shear the oil down to a 30 weight, and they were stock.

I've become a lab geek!

 

[quote=white Buffalo;8359994I've become a lab geek! [/quote]

So if you've become a lab geek, explain why Valvoline smokes more out the CCV than the others after a few thousand miles. Also why does Delvac stink worse than all the others after about 4k?

 

Condensation/humidity , got me



Maybe the stink by the Gulf Coast refinery that makes it snuck in there.....



You got me on both accounts.....

 

is it true that once you go with synthetic oil you need to stay with it or can i go to the regular 5w40?

 

It's an old wives tale. I've gone back and forth on my 2000 and it has 180,000 miles and doesn't leak anywhere. I go back and forth with my wife's 2003 Exploder with 110,000 miles and it doesn't leak at all either.

 

Not true, you can change anytime.

You won't find a dino 5W-40, they are synthetic. 15W-40 is available in dino or a blend.

 

Synthetic user since 15,000 mile, woo, I should have this info booked mark how many times oil threads come up but maybe a couple blends in there but I had some shearing issues on my first load of Schaeffers 9000 5w-40 syn. I ran Rotella syn for all those years at about 10,000 mile intervals and when I tested my first batch of Schaeffers, my weight went from a 40 to a 30. I talked to Rich white Buffalo above, thank Rich, and it was determined I needed a higher viscosity oil because of my change intervals and mods I'm running Schaeffers 7000 blend, 50%-50%. This is my first load of the 7000 so after the second change I'll shoot out a sample. If Rich remembers our covo, he'll correct me if I'm wrong. So my oppinion, run the synthetics in all weather, your truck will love you but your wallet won't, whats more important, lol..

 

Nice report Chris. Especially with the miles you've racked up! I only have half the miles you show on the report. Isn't the Delo 400 in the left column though? I only noticed because I have had similarly strong Blackstone OA's on Delo 400 and noticed the strong additive presence. Particularly molybdenum and the boron. Always far above the universal averages.

 

We'll see.

I heard about it from Mike (Blowby). He uses it on all of his PSD's, including his 1000 hp truck.

Right now, Rotella Synthetic lasts about 5000 miles in my truck. Beyond that and I start gambling. I've gone 8000 miles on it before.... didn't like what came out of the oil pan.

 

So far it's been the opposite for me. I've found that when I do run 15w-40 oil, it shears faster than 5w-40. I've run Motorcraft, Delo, and Rotella dino 15w-40, and they can't make it much further than 3000 miles with dual HPOP's on my truck. That's why I typically run synthetics. They've all tended to resist sheering more.

5000 miles on a 15w-40 oil turns to the consistency of water. Synthetics will go about 8000 miles before reaching that point. However, I don't like running that many miles on those oils. I like to change them before they get to that point.