6.0 Engine Oil
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Junior User
Joined: Jan 2004
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From: Hagerstown MD
6.0 Engine Oil
Just to let everybody know, I have been using rotella 15-40 for 25000 miles. I changed my oil today but I could not get the rotella. I heard on this site that the delo (chevron) oil was good so I switched and WOW , what a sound. As soon as i started the truck to get the oil in new filter, It sounded like a different truck. QUIETER, smoother running, all while chilly outside. I then went out to get fuel and once fully warmed up it was even more quiet. The whole motor sounds like it is running smoother. I could hardly even haer the motor with windows up while cruising. Maby my mileage will go up as well. I never thought an oil of the same weight could make that much of a difference. No more rotella for me.
Senior User
Joined: Jul 2004
Posts: 285
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From: north louisiana
I heard about the Delo making the motor quieter on another post a while back. I might give it a go at 30,000 if I don't get the Mobil Truck/SUV. Thanks for the info. Haven't gotten used to my truck sound since they Nixxed the PI with the OCT.flash in my 03. It is really louder when cold....almost sounds like a Cummins. I was parked next to an older 7.3 at the pump the other day, and I honestly wasn't sure if my truck was any quiter than his was. Sure is a big change from when I bought it. That was one of the reasons I got that truck, and not the 7.3. I didn't like the engine noise of the 7.3, especially at highway speed. Now, mine isn't much better that that, at least as far as I can hear.
Cargo Master
Joined: Jun 2003
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From: Carlsbad, California
Originally Posted by johnnyk
Just to let everybody know, I have been using rotella 15-40 for 25000 miles. I changed my oil today but I could not get the rotella. I heard on this site that the delo (chevron) oil was good so I switched and WOW , what a sound. As soon as i started the truck to get the oil in new filter, It sounded like a different truck. QUIETER, smoother running, all while chilly outside. I then went out to get fuel and once fully warmed up it was even more quiet. The whole motor sounds like it is running smoother. I could hardly even haer the motor with windows up while cruising. Maby my mileage will go up as well. I never thought an oil of the same weight could make that much of a difference. No more rotella for me.
The truck is slightly louder and doesn't idle quite as smoothly - oil level is on the lower 1/4 of the dipstick.
It will be interesting to compare the oil analysis from Blackstone on the next oil change and see what difference - if any - is reported.
Senior User
Joined: Dec 2004
Posts: 399
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From: New York
guydiver12, i thought that you had to use a specific type of oil for the diesel engine??? but isnt the mobil truck/SUV meant for gas engines?? the reason i ask this is because i was told with the 7.3, you had to have an oil for diesel only because it contained a different additive
Postmaster
Joined: Aug 2003
Posts: 4,483
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From: Central Texas
I have been using the Castrol RX 15-40 API CI-4 and switched to Delo 400 CI-4 and in my estimation, the engine was much louder. I was amazed. I went back to Rotella T synthetic. I haven't seen that much difference for the price. I am about to change oil and I bought the Castrol RX again.
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