Chevron Delo400 15W40 vs Shell Rotella-T 15W40 - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 07-25-2005, 03:33 PM   #1 (permalink)
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Chevron Delo400 15W40 vs Shell Rotella-T 15W40

According to the ChevronTexaco website Delo400 has a better additive pachage than Rotella-T.Delo400 has more sulfated ash and more detergents than Rotella-T.I'm trying to find which of the two will deliver better performance.I think Rotella-T is a bigger seller than Delo400.I believe more truckers use Rotella-T more.Thanks Joe [img]/ubbthreads/images/graemlins/smokin.gif[/img]
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Old 07-25-2005, 04:14 PM   #2 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

I know a lot of folks here use the Rotella. I tried it and did not care for it. My truck seems to run a touch quieter and much smoother with the Delo. I always used Delo on my other PSD and it liked it too. [img]/ubbthreads/images/graemlins/shrug.gif[/img]

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Old 07-25-2005, 04:21 PM   #3 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

I'd always used Rotella T until one day when I found that Walmart was out of it. I picked up some Delo, which happened to be cheaper, and have used that for the last two oil changes. Truck seems to run just fine on both oils. I'd just pick one and go with it. Delo is about $1/gal cheaper here, which decides it for me.
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Old 07-25-2005, 04:30 PM   #4 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

I just changed the oil in my truck it made my truck alot quieter.
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Old 07-25-2005, 05:47 PM   #5 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

What oil did you use? [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 07-25-2005, 06:40 PM   #6 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

i just swiched from rotella to delo and i have to say my engine does seem quieter. [img]/ubbthreads/images/graemlins/shrug.gif[/img]. i do not know why or how. maybe i am dreaming.
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Old 07-25-2005, 06:52 PM   #7 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

[img]/ubbthreads/images/graemlins/shrug.gif[/img]
Why would the same weight oil cause a veh to run quieter ???
If it was a heavier weight I could understand but why ???
Maybe someone that "keeps" everything or knows a lot will answer...
I would hope so .....
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Old 07-25-2005, 07:04 PM   #8 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

Right now I use Shell Rotella-T 15W40.I'm thinking about switching to Delo400 on my next oil change.The truck has 105,400 miles on her and I'm changing the oil every 3000 miles.Joe [img]/ubbthreads/images/graemlins/smokin.gif[/img]
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Old 07-25-2005, 07:08 PM   #9 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

i do not know why it would be quieter with the same weight oil. but i do know i swiched from 5w30 castrol to 5w30 mobil 1 in my wifes tahoe and it ticked at idle when worm. i swiched back and it was gone. both with the same ac delco filter. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 07-25-2005, 08:45 PM   #10 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

They're both good, but I like Delo because it's a good oil and it's about a buck/gallon cheaper...
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Old 07-25-2005, 10:03 PM   #11 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

I have used both subject oils, each about half the total 84000 miles on the truck. Can not detect any difference in sound or performance.
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Old 07-25-2005, 10:48 PM   #12 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

I use Delo400....Dad has used it on his 89' IDI for 16 years, no probs. Plus Costco sells Delo by the case for right at $6/gal. [img]/ubbthreads/images/graemlins/smokin.gif[/img]
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Old 07-26-2005, 11:33 AM   #13 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

I have noticed this about changing the oil on my early 99. It did not matter what oil I used as long as it was 15W-40 but it always is quiter after an oil change. I change my oil at 5K as recommended and the environment in Florida is mostly low speed highway driving at around 55-60 mph.
I thought this was a placebo effect and I was imaging the quieter dB levels after an oil change but everyone here seems to agree that is the case.
This is not true for any of the other vehicles I own just this one.
Is it possible that with standard filtering systems that we pick up enough soot trash at greater then 5 microns to 15 microns that this helps to transmit noise?
I would really like to hear from the guys using the added filtration oil systems that filter this crap out to hear what they say about noise level after an oil change.
I used to have a dBA meter and if I can find it I plan to do a side by side comparison of this.
Anyway after an oil change the dB level is noticable and I now feel that I was not imaging things.
By the way the oils I used were Rotella Synthetic and Dino at the same weights.
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Old 07-26-2005, 03:00 PM   #14 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

I've always used Delo. The maintenance shop that we use for our fire apparatus swears by it.
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Old 07-26-2005, 03:11 PM   #15 (permalink)
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Re: Chevron Delo400 15W40 vs Shell Rotella-T 15W40

Its not the dirt in the oil that is causing the noise but air. The oils anti-foaming additives are used up over the life of the oil. The fresh oil does not foam as badly or to put it another way, releases the air bubbles faster than the old oil did. The lower air content results in a quieter running engine as the air effects injection timing due to its compressability.
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