The shear should not affect the synthetic oils as does the standard 15w40. Any thoughts?

 

I had heard that. I use Mobil Delvac 1.

I run an autometer mechanical oil pressure gage. Any shear would show up as a decline in oil pressure. I have 16,000 miles and have noticed no drop in oil pressure. I plan to take a sample and have it tested. We will see.

 

Bob have you sent any of your oil reports in to be tested?

 

Hey guys....

According to Blackstone, ALL oils are showing signs of breaking down in the 6.0L motor.

They told me today that synthetics have shown the same, better and worse wear factors, but the guy I talked to could not give me names or types to consider.

I asked Blackstone if they could address this issue so we as consumers could learn from the data... and it wold boost their business!!!

Questions I asked:

1) If all oils break down, which ones performed better?

2) Please provide me (us) with a database of brands and types of their "average" viscosity rating?

3) How do I know what brand to switch to based upon their comments... don;t leave me and others hanging, but use the information they have collected and let us learn fromt it... heck, charge me $5.00 for the information (trying to spur them on so I can get some sort of data set to review.)

4) Do synthetics perform better than convential oils... his naswer was that ALL oils on average are showing signs of "shearing"!!!
____________________________________________

I read in another post (have no independant way to verify) that convential oils that are multigrade have a long molecule bond and are subject to breaking down. Synthetics are a "man-made" bond that is shorter and acts like a multi-grade oil, but due to be being shorter, is less easliy broken down... and a straight weight oil has the shortest bond and is the HARDEST bond to break down (escept straight weight oils can NOT used).

Thanks,

Jeff

 

I will as soon as I can figure out how to get it out of that tiny deep hole that the oil stick comes out of!

 

How big of a problem is oil shearing? Do any other engines have the same issue? It sounds like any oil you put in the 6.0 will have some shearing. Does it begin shearing and then level out?

Jeff,

My first two reports show:
SUS VISCOSITY @ 210 ºF,
VALUES SHOULD BE
69-78
and I show a value of 63.5 on the first report with 3,679 Miles Delo and on the second with 3,469 Miles Castrol 64.3

How do you equate the shearing with 40wt down to 30wt?

 

I use Delvac 1. OA at 3000 miles on oil showed the same shearing as other oils. I'm going to send in another sample at 6000 miles on oil (about another 500 miles from now) to see if the shearing has stabilized or has continued to degrade. As far as other engines having the same shearing problem, the 7.3 does not.

 

Did you keep you oil reports from you 7.3?
Wondering if you could tell, over time, if it stopped.

 

This is really weird. Maybe the 4,000 PSI in the high pressure oil system is too much for the oil. They say that enough heat and pressure will change the molecular structure of anything.

We will be waiting for your 6,000 mile test. It's possible that 5,000 miles is the limit for any oil in this engine. It's O.K. with me because 4,000 is where I start looking for a chance to change mine.

We need someone to test Rotella T synthetic.

 

This could be true, I am going to send mine in next week or the one after that or...............really soon!
I must get it in pretty quick becasue I leave in six weeks for a really long pull.
1504 miles one way.......ug

 

SBV45 & Choctaw Bob,

As the viscosity number goes down it correlates to particular weight of oil. The lower the number Less than (65) you approach that of a 30 weight oil. The higher the number (above 75) you approach that of a 50 weight.

Oil can thin out (as ours is doing) or it can thicken with overuse and it starts to build up with carbon and coke (from extreme heat). Thee is a good website that explains a lot about oil, not adding additives to your oil and the like.

The site is: http://www.bobistheoilguy.com/

It has been well explained on the www.dieelstop.com website that "shearing" of ALL oil in the 6.0L motor is due to the high-pressue rail system that fired the injectors. Bottom line is that oil was meant as a lubricant... NOT as a hydrolic oil to run at high-pressures!!! The high pressures of the 6.0L system is breaking down this oil before its time. SOme have asked about hydrolic fluid, but as you know the same oil lubes the low pressure side of the system and would not provide the appropiate lubrication like an oil should.

What has surprised me is that the dieseltop website has been discussing this issue for some time (oil shearing)... but unitl my Blackstone report and posts, this was the first (I can at least remember) of people discussing this very important topic!!!

The lower the viscosity of an oil, the less it protects between two moving parts of metal (under pressure).

Hope this answers both of your questions.

Thanks,

Jeff

 

Do you think you are, maybe just a bit over reacting to this. Do not take that personal!
I can agree if you try to run your oil out to the 7K or beyond..........but at normal interval change????

I think this is one of those things in life that could be blown way out of proportion. IMO.
Jeff you know I am not attacking you.

 

The 6.0 is my first diesel. My comment of the 7.3 comes from data thats been collected on them since 99. Heres a link to the 7.3 pdf file. Heres a link to the 6.0 pdf file.

 

Jeff, Ive noticed you started posting there recently. This is the exact reason I don't limit my information source to just one site. You never know what you can learn if you don't look.

 

The problem I have with comparing them, you are comparing apples to oranges.

The oil itself does not go through the same stresses in both engines.
Each operating system is very different in design and pressures, even flow rates.