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Old 11-06-2012, 02:21 PM   #1
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which oil do you use in you diesel truck

I just got my first diesel truck. I picked up a 99 f250 with a 7.3 diesel engine. It needs a oil change. I live in the cincinnati area, so I'm trying to figure out regular or synthetic and 15w-40 or 5w-40 for the winter months. Please give me your input. I'm leaning toward mobil 1 Diesel truck 5w-40 oil with a motorcraft filter.
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Old 11-06-2012, 02:27 PM   #2
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Since it's not wise to extend change intervals the only significant advantage of a synthetic oil in a diesel is extreme cold starting. Given that reality the standard 15W-40 stuff is usually the best choice for most, but if you will frequently be parked outside in Ohio winters then I'd say you qualify for using the 5W synthetic. Any major brand (Mobil 1, Delo, Rotella) is fine, just pick the bottle color you like the best.
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Old 11-06-2012, 02:44 PM   #3
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I have used Amsoil 15 - 40 Diesel & Marine Motor oil for almost 20 years. Change the oil once a year or 25,000 miles in my pick up and motor home. I have always passed the oil anlysis with flying color and could actually go longer but I am little hard headed going more then the 25K or one a year. If you sign up as a preferred costumer you will get their products at wholesale. I live in the North East corner of Washington State where temps fall far below 0 and have no problems start the engine.

http://www.amsoil.com/storefront/ame.aspx
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Old 11-06-2012, 04:09 PM   #4
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mcsquid86, no comment on the oil question but here are a couple of great forums for Ford Superduty owners Super Duty & Heavy Duty - Ford Truck Enthusiasts Forums or Diesel Forum - TheDieselStop.com

Regards, Retreever
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Old 11-06-2012, 04:21 PM   #5
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Shell rotella t 15w-40
This oil runs a pile of semi's across our country everyday and has for a long time.
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Old 11-06-2012, 07:08 PM   #6
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Rotella T6
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Old 11-06-2012, 07:16 PM   #7
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Which oil do you run

Rotella 15-40
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Old 11-06-2012, 07:21 PM   #8
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Powerstroke.org
Also - read this - How HEUI works and best to convert - Ford Powerstroke Diesel Forum
That will explain how motor oil is SO important in a 7.3, and 6.0 as well.
That being said, synthetic is always "best." 7.3s are very forgiving. For winters, I'd use 5W40 if you can.
Also, I'd check your glow plugs and glow plug relay, batteries, and battery connections. - Winter Operation, Hard Starting, Hissing Sound Etc... - Ford Powerstroke Diesel Forum
Troubleshooting GPR & GP's - Ford Powerstroke Diesel Forum
Personally, for filters, I run all Baldwin if possible. Fuel, oil, transmission, coolant, air. FoMoCo is always a good bet too, and pretty cheap at auto stores.
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Old 11-06-2012, 07:45 PM   #9
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Quote:
Originally Posted by palehorse89
Shell rotella t 15w-40
This oil runs a pile of semi's across our country everyday and has for a long time.
I'm driving my first diesel and using Shell Rotella T 15w-40. With my Dodge i've been advised to change the fuel filter when I change the oil. Good luck on your decision.
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Old 11-06-2012, 07:59 PM   #10
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I use Rotella SYN 5W-40 in mine.
For any starts below 50' F I'd plug in the block heater. It will make the engine last longer.
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Old 11-06-2012, 08:14 PM   #11
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Been runnning Delo 15W40 in my diesels for 12 years now. Just had an analysis on my oil in the ISC w/Banks after a year of running it, they said to go another 5,000 miles and retest.
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Old 11-06-2012, 08:18 PM   #12
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Originally Posted by Mr_D View Post
Been runnning Delo 15W40 in my diesels for 12 years now. Just had an analysis on my oil in the ISC w/Banks after a year of running it, they said to go another 5,000 miles and retest.
Is that an HEUI motor or mech. injection?
What type of filtering?
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Old 11-06-2012, 10:33 PM   #13
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Thanks everybody I went with the Rotella T6 synthetic and a motorcraft filter. I also changed my fuel filter. Thanks for helping out a Newbie
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