Delo vs. Rotella vs. Delvac for 12-Valve Cummins

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Originally Posted By: SilverC6
Originally Posted By: sw99
I am on a Delo kick since they lowered the price at WM. Now it's $11.53 for the gallon.


Did you take advantage of the Delo rebate last month?

$15 off 3 gallons of Delo 15W-40 and $20 off 3 gallons of Delo 5W-40 synthetic.

I felt like I was stealing something leaving Walmart last weekend.

There is still time to file it. Hopefully you still have your receipts.


That is a great sale.
 
I know this topic was from a while back...but I originally did go with the Delo 400LE 15W-40 Conventional for 5,000 miles or so.

Just changed my oil this past week, and I had the itch to try a synthetic. I went with the Delo 400LE 5W-40 Synthetic.

To my surprise oil consumption does not seem to have increased in the 1,000 miles or so since the change. I was fully expecting the consumption to increase compared to the conventional. Again, this is a motor with 325,000 miles.

Also went with a Fram Ultra filter. Used that for the past couple changes. Doesn't seem to be any better/worse than the FleetGuard Stratpore filter I have been using during all previous changes. And it's much easier to grab at my local Wal-Mart than either ordering online or heading to Cummins for the FleetGuard.

I will keep posted on if the synthetic indeed does use more oil than the conventional. Only real difference I can tell (I think), is the motor seems to have quieted down a bit.
 
My diesel mechanic has two 5.9 cummins...all he runs is Delo 400 LE 5w40. I have an '07 6.0 powerstroke and been running Delo 400 LE 5w30, quiet the injectors down a bit and much smoother cold starts. Dad runs Delo too in the CAT 330 RV.
 
Originally Posted By: artificialist
How does a diesel engine re-route blow-by gasses into the air intake? You should check that equipment to see if it is functioning properly.

Check the turbocharger for compressor side oil leaks. Remove some of the air intake tubing and see if oil is in there.


Diesels, since the EPA regs of 2007 kicked in, are required to be CCV just like the gassers. Everything from ag tractors, to cars, to pickups, heavy commercial trucks, to construction equipment. No more blow by just being vented into the atmosphere as before. Many of the small diesels do this by having a PCV style setup that the tube is hooked up in the intake just before the turbo. My 2006 Jeep Liberty Diesel had a similar setup. The heavy commercial diesel at least do it a little differently and also have air / oil separator that keep a lion's share of oil vapor from getting in intake and messing with the already sooty EGR gasses being routed into the intake.

On the question of the Kendall 15w40, I used the conventional Kendall 15w40 in a 1996 Cummins N-14. It got 30,000 mile oil changes, and when I sold it, it had 1.4 million miles on it. Went right to work for the next owner. I would say it did a good job!
 
I am surprised this sight does not have a sticky some place covering " Synthetic will not cause the engine to leak more oil or burn more oil!" This is not 1950's and few here are working on engines with rope seals, leather gaskets or paper gaskets!!!

More to the point if the engine is leaking oil or burning oil right now then their is no magic in what you are currently using either or it would not be leaking and burning oil!

Oil leaks are caused by worn out or damaged gaskets and oil consumption is caused by worn parts like guides,seals, rings, liners etc.....

A change in oil might magnify existing problems but they are never the cause of the problem and they will never cure a problem. At best they can be a band-aide.

Every time I put Pensoil Platinum Synthetic in any device I own or service oil consumption increases.When I switch back to almost any other synthetic or dino oil consumption disappears. The PP is not damaging my engine at all. It does not seem to be a good fit for anything I own or service but it is not doing any harm. I use other synthetics and do not see this happen so the word "synthetic" printed on the bottle is not the cause of the problem.

I am not trying to be offensive or mean either. I am just saying that one needs to look a bit deeper than the marketing term "synthetic" to see what is going on in an engine and what oil will be a good fit. In North America "synthetic" is nothing more than a marketing term and tells you almost nothing about the oil in the plastic jug.
 
Do you have KDP done? If not....worry less about the oil, and more about that.



Originally Posted By: clintonhutson
Hey guys,

I have read multiple topics on this, and I think I've came to the conclusion that you can run any of these oils and you will never have an oil-related problem.

I am wanting to go back to one of the "Big Three" HDEO's. My last two OCI's were run with SuperTech 15W40. Haven't had any problems with the oil, but my motor does seem to consume it at a higher rate than when I ran a name-brand oil. Keep in mind, this is going in my 98 Dodge Ram with the Cummins 12-Valve engine. Has 325,000 miles on her as of new, and it is my DD. I realize some consumption with this motor is to be expected, but I would like to minimize it if possible.

Also, it really doesn't leak oil, just consumes it. With a name-brand HDEO that was about 1 qt every 5,000 - 6,000 miles...and with the SuperTech that number doubled.

So in the end, I am asking, in my application...about 60% Highway / 40% City driving, and minimal towing, what would you recommend?
 
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Originally Posted By: SilverC6
Delo is a little thicker than the rest.

That may help with consumption.

Delo 400LE 15W-40 is in my Cummins right now.

I like the extra moly and boron.

Same here, i've been thinking about what oil to use in my diesel Toyota and based on the tests done by PQIA i'm leaning towards the Delo 400LE.

Reasons are because low temp viscosity is irrelevant for me, ambient temp barely gets to 24C and thats considered low. Most of the times its around 26C-27C.
OCI recommended by manual is 5K Kilometers, which means the oil and TBN will probably be in pretty good condition and will handle the OCI easily.
Extra antiwear additives are always a good thing. Zinc, Phos, Moly and Boron.
 
Originally Posted By: clintonhutson
I know this topic was from a while back...but I originally did go with the Delo 400LE 15W-40 Conventional for 5,000 miles or so.

Just changed my oil this past week, and I had the itch to try a synthetic. I went with the Delo 400LE 5W-40 Synthetic.

To my surprise oil consumption does not seem to have increased in the 1,000 miles or so since the change. I was fully expecting the consumption to increase compared to the conventional. Again, this is a motor with 325,000 miles.

I will keep posted on if the synthetic indeed does use more oil than the conventional. Only real difference I can tell (I think), is the motor seems to have quieted down a bit.


Glad to hear the Delo is working well for you.
 
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