Diesel Oil Faceoff! - Rotella-T, Rotella-T6, Delo 400, Mobil1 5-40 - Mercedes-Benz Forum

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Old 08-21-2012, 11:35 AM   #1 (permalink)
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Diesel Oil Faceoff! - Rotella-T, Rotella-T6, Delo 400, Mobil1 5-40

Uh Oh....OIL THREAD ALERT!!!

Reasons WHY you should run diesel API CJ-4 oil in your 103/104 if you are unaware..
Oil Alert For Older Cars | Eric Peters Autos
Labs done by: http://www.blackstone-labs.com/
How to read the lab tests: http://www.blackstone-labs.com/report-explanation.php --> click gas/diesel.
Calcium and elements below are additives. More the better.
Universal Averages I confirmed from blackstone are the M103 engine -- you can see most oils they sample have LESS additives+detergents than what mine is showing -- more than likely because anybody else uses non-diesel oils without these important additives.

Its time to change the oil on the wagon. This is the first time I have put Synthetic in her (the Rotella-T6). I did it after I resealed my front timing cover and no new leaks at all which is great....so there is a warning for those who are considering changing to synthetic...if you already have leaks, or have a leak that is close, its going to leak worse.
I am going to do the oil change with it, run for 6k mi then send it in for Analysis and report back in 6 months (yeh sorry for the uplifting thread title lol...) I just want to track everything.

Once I get my Rotella-T6 sample back, I will post it up so we can compare readings against both the Rotella-T non-synthetic cousin and Delo 400 non-synthetic....then once I have 6k on the Mobil1 synthetic, its gotta face off all 3 prior samples to find who is superior

So without more adue:
Here is the faceoff once I get all samples back:
VS:
VS:
VS:

Here are my prior samples from standard 15-40 Rotella-T and 15-40 Delo 400.
You can see so far the Delo 400 seems a better buy than Rotella-T due to more additives...but who knows "what" that means in terms of wear, but I'll take more additives for peace of mind

Note: The higher metal wear shown below is probably due to the fact I have the original pre-chilled cam + rockers which are known to wear fast. Pre 89's -- you have them too.

Rotella-T NON-Synthetic 15-40

Delo 400 NON-Synthetic 15-40

Rotella-T6 5-40 Synthetic COMING SOON.
Mobil1 Turbo Diesel Truck 5-40 Synthetic COMING SOON
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Last edited by ps2cho; 08-21-2012 at 11:42 AM.
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Old 08-21-2012, 11:39 AM   #2 (permalink)
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I'm quite happy to run Delo in my entire fleet, including both gas and diesel engines
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Old 08-21-2012, 11:45 AM   #3 (permalink)
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Yep, its a great choice for both Gas and Diesel. I won't choose Rotella-T over Delo 400 based on my findings now that I know. I think its slightly cheaper than Rotella-T too...no brainer!

Once I have the Mobil1 and Rotella-T6 synthetic data, I may run the following oil change for 10k and see what it looks like since I mostly do 80% freeway.
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Old 08-21-2012, 11:53 AM   #4 (permalink)
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I run Delo 400 in my 7.3 Powerstroke. Blackstone OA's consistently come back well. It's particularly hard on motor oil due to the injectors being pressurized and activated by the crankcase oil under high presure, so it is prone to shearing. I have found the Delo to be more resistant to shearing than Rotella (dino). It also has a very strong additive package which always comes back above average.
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Old 08-21-2012, 04:24 PM   #5 (permalink)
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Cost

How much do you pay per liiter or quart of each?

How much does the Blackstone OA cost?

Thanks.
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Old 08-21-2012, 04:52 PM   #6 (permalink)
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Quote:
Originally Posted by ds190 View Post
How much do you pay per liiter or quart of each?

How much does the Blackstone OA cost?

Thanks.
Delo 400 is at Costco for about $12.50/gallon. Blackstone is $25 for an OA.
Here's a link for a free kit: Blackstone Labs
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Old 08-21-2012, 05:31 PM   #7 (permalink)
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Delo 400 + Rotella-T are pretty much the same @ ~$12-14/gal. Rotella-T6 is ~$22/gal and Mobil1 HD Diesel Truck Synthetic is ~$26/gallon.
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Old 08-21-2012, 06:33 PM   #8 (permalink)
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+1 on buying Delo400 from Costco. Last time around, I bought around 100 gallons or so and I am getting ready to buy another batch in the very near future.
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Old 08-21-2012, 07:27 PM   #9 (permalink)
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Don't know how you guys read the report, but I see for example 18 irons on Delo and 13 on Rotella T.
It makes Delo coming with about 38% more engine wear, although I did ignore mileage difference.
I did test several oils on my Powerstroke and Rottella comes ahead of any competition on the market. Some will argue that I did not test Amsoil, but it is their problem.
Suprizigly T6 did not make big difference comparing to dino Rotella, but I still rather pay extra for extra protection of the synthetic, than not.
Weeks ago oil pump jammed on our 300DT and engine run some time with no oil pressure with no ill results. I prize synthetic for it.

Last edited by Kajtek1; 08-21-2012 at 07:30 PM.
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Old 08-21-2012, 07:36 PM   #10 (permalink)
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Zinc (ZDDP)is the most important additive for these older engines to minimize component wear. It is abundant in Delo400, much less so in others.

These older engines were engineered, tested and factory filled with diesel grade conventional 15W-40 regardless of fuel type.
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