Man, I feel sortive stupid. I've been reading for years on these trucks and thought I had glo plugs in my engine the whole time. lol. I guess I had to learn the right way sometime.

Thanks for informing me buddy, that's why this site is top notch.

 

This is exactly why I do it. I can't always plug in, and I hate how long it takes for the oil pressure gauge to come up after the engine starts on a cold morning.

 

While that is true, our trucks DO COME from the factory filled with SYNTHETIC:

Transmission Fluid
Differential Fluid

I do believe that the main reasons why synthetics are NOT used in the Cummins from the factory is that they are REALLY BUILT TOUGH. Theses engines are overbuilt and this alone is a HUGE advantage and can offset NOT using synthetic motor oil.

Now, if the engines were built mediocre, synthetic engine oil would make a much more noticeable difference. That is why vehicles with engines that are built with average durability see HUGE advantages and longevity when running synthetic over conventional oil.

 

EXACTLY!
Check out this video. The conventional oil is flowing like molasses. The synthetic is 1000x better....

http://www.youtube.com/watch?v=VRq2LGvX49o

 

Hey no worries, and anytime. The day I stop learning is the day they shovel dirt on me, for good


The thing is with our trucks, is this: Cummins motors are GREAT cold start up motors. AND, we never have issue with the grid heater. SOOOOO, since we NEVER have to worry about a grid heater going bad, it is something that really does not get talked about. SOOOOOO, out of site, out of mind so to speak.

I just learned yesterday that our oil pressure gauge is not accurate. Just a "dummy indicator". Ya See, learn something new everyday!

 

I switched to 5-40 rotella from 15-40 with the intention of just running synthetic for the winter months. The difference was noticable enough that I never switched back. Easier cold starts, slightly better MPG, and a quieter/smoother running engine. I still change the oil at 7,500 mile intervals but could probably run over 10,000 between changes. For $6 more per gallon, is the Mobile 5-40 that much better than Rotella 5-40?

 

The C stands for commercial certification

 

Another "observation" is that when people run synthetic oil, they are told that it is a complete waste of money. That they are throwing money away down the drain.

Yet, these same people who make these statements, have THOUSANDS of dollars in MODS listed in their profiles.

It's funny how that happens. You can post in the MODS section that you spent $5K in aftermarket MODS on your truck and nobody says "What a waste of money". That same person can then post and state they spent $30.00 more on a synthetic motor oil change and they are then "throwing away money".

Interesting,.,,,

 

I believe the reason synthetic isnt in the CTD is the break in oeriod required for these engines . New gas engines like Corvette and such dont have a break in schedual anymore thats why they come directly from the factory with Synthetics .

from RV.net response from Cummins about synthetics

Powermaster@cummins.com wrote:
Date: Mon, 17 Sep 2007 09:26:28 -0400 (EDT)
From: Powermaster@cummins.com
Subject: Re: RQST00000505925
To: xxxxxxxxxx

Summary: Synthetic Oil

Solution:
Thanks for your Email message. You have contacted Cummins, Inc. at our Customer Assistance Center located in Columbus, Indiana. This is our worldwide headquarters and has been our home since Clessie Cummins founded the company February 3, 1919.

We recommend not using synthetic oil till after the first regular oil change and not extending oil changes when using synthetic oil.

The properties of synthetic oil that allow longer oil change intervals, in gasoline engines without oil cooler, do not help in diesel engines with oil coolers.

We thank you for your interest in Cummins products. We occasionally misunderstand a question. If our answer to your communication looks like we have misunderstood your e-mail please reply with further inquiry.

To locate the nearest Cummins-authorized Dealer or Distributor Service Provider use option #2 on our toll free customer assistance line 1-800-DIESELS (343-7357) or for computer assistance in locating a Service Provider, use Cummins Service Locator, which can be found on Cummins website:

http://wsl.cummins.com/ServiceLocato...n=showworldmap

Please let us know if you have other questions and if away from your computer or have a time-critical request that needs more urgent attention, feel free to call us toll-free (from North America) at option #4 on 1-800-DIESELS (343-7357).
Cummins Email (via webpage):

http://www.cummins.com/cmi/content.j...33&menuIndex=7

Customer Assistance Center
Cummins, Inc.
Columbus, Indiana, USA

Details:

Comments:
I have a new 2007 Dodge RAM 2500 with the 6.7 diesel. How many miles must I drive before I can use synthetic motor oil?
Dodge\'s owners manual says 7500, people online say 20,000.
What does Cummins say?
Thanks,
xxxxxx

 

I'm amazed that people think a 5W-40 oil is "thinner" than a "15W-40" when it gets hot.

At operating temp a 5W-40 provides the same protection as a 15W-40 oil. The 5W or 15W specifies the centistoke rating at cold crank temperatures, whereas the 40W specifies the protection during normal operating conditions.

The only difference between a 5W-40 and a 15W-40 oil is cold weather pumpability. 5W has better cold flow characteristics, whereas the 15W is thicker and doesn't flow as well when cold.

I trust science and technology to let me know what the oil is like (used oil analysis) -vs- what the oil looks like coming out of the pan. My

 

Pretty simple actually. A MOD changes teh performance of my truck. My TST changes teh way my truck runs, better fuel economy when I can keep my foot out of it. More towing power. Better driveability. My gauges monitor my trucks vitals for me. My exhaust helps the truck breathe better, be more efficient. My toolbox carries my tools. My hitch hauls my trailer. My air fitler does a better job of filterig the air and allowing my motor to breathe better. My Walbro replaced the factory lift pump when it went out, AND I saved money doing it. My brake controller stops my trailer. My bed liner protects my bed.


The Silencer ring was a free MOD, and makes my truck sound cool
The debadging of my truck was free, and makes it look cool
What does Synthetic Oil do that my Dino does not????? NOTHING! So, it is waste of money.

 

Once again, THAT IS NOT TRUE! There are hundreds and hundreds of SCIENTIFIC studies done by independent labs that show SYNTHETIC oil is a superior oil vs. conventional. It is NOT even debatable.

To state otherwise, is like stating there is NO evidence that asbestos causes health problems.

To state that synthetic oil does the same thing that conventional oil does, is a lie. What we are "discussing" is that IF our Cummins engines can get more longevity from using it. Due to the heavy duty design of the Cummins, measuring the benefits of synthetic is more difficult to do.

I can tell you that synthetic will PUMP FASTER and have MORE FLOW (90% more flow from studies) than conventional oil in below freezing temperatures. THAT IS A FACT!

You can mod all day, I have NO PROBLEMS, I will not even tell you that it is a waste of money. It is YOUR truck and YOUR money. Your comments, "waste of money" has been thrown AT ME and others who choose to use synthetic. If YOU don't want to use it, then don't, telling others it is a "waste of money" attacks the person. NOBODY here told you that your MODS are a waste of money. Yet YOU constantly keep posting that comment about synthetic oil users. If every time you made a post about some MOD that you did, then some poster would come along and would keep stating, "what a waste of money". Think about it...

You can state your disagreement but your constant, "waste of money" comments are unnecessary. People who do that are called "trolls" as they are not contributing to the posting, but simply attacking and making snide remarks at the poster and topic at hand.

 

Like I said, if it reaches 32* here, it is news. Just does not happen. So, that is not a benefit to me.

I have owned many vehicles, most with high mileage, and never used systhetic, and never had a motor problem. So, synthetic is NOT doing anything for me, so hence, is a waste of money. There are no benefits for me to run it, none. Do you understand my point there? You make some good points, but none of them apply to me,that is what I am saying. You can not give me one reason to run synthetic oil. That is what I am trying to say, that's all.

 

Never meant to sound like I was talking about others, even if I was talking in the third person. I am talking about me and my use or need.

 

I think Mobile is a true synthetic and Rotella is highly refined dino oil.