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Old 10-16-2006, 09:07 AM   #1
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Duramax oil change

Due for my first oil change at 5k miles. Lots of these miles have been towing. I would like to switch to syn oil but have a couple of ?
  • Some folks claim to wait a little while to break in before switching to syn…if so, how many miles? I always switch my gassers at first oil change.Is it a good idea to switch at 5k miles?
  • Which Mobil1 should I use? I was at Wallyworld and could not find one that said it was for diesel engines?
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Old 10-16-2006, 09:14 AM   #2
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If it was my truck I would consider this Mobil1 product.

http://www.mobil1.com/USA-English/Mo...uck_5W-40.aspx

Jack
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Old 10-16-2006, 10:23 AM   #3
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I use Amsoil 15W-40 heavy duty diesel oil, changed at 5K miles. Also use Amsoil tranny fluid and rear end lube. Initial cost is higher, but what's piece of mind worth? I think Amsoil products offer best quality at moderate price. FWIW of course.
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Old 10-16-2006, 11:13 AM   #4
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No Mobil-1 5W-40 at Wally World

Cummins recommends 5W-40 synthetic if the overnite temps get below 20F.
In Michigan, that is quite a bit of the year!
I had to shop around town to find it, but Murray's Auto Parts had the Mobil-1
5W-40. If you check your local auto parts places, you should be able to
find some.
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Old 10-16-2006, 03:08 PM   #5
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If you are going with 5K oil changes, just use Mobil Delvac 1300 15W40, or Chevron Delo 400 15W40. I am sick of wasting time trying to hunt down Mobile 1's Turbo Diesel, and then having to pay $6 a quart for the stuff. I can buy a gallon of dino oil for $2 more. Most of the UOA's I have seen on M1 syn are just about the same as the dino 15W40 oils.
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Old 10-16-2006, 03:14 PM   #6
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i have a 98 6.5 turbo diesel silverado i use as a backup tow vehicle and plowing snow.

15w40 rotella T by shell, about 7 bucks a gallon at most farm stores and truck stops.

i just can't see the advantage in synth oil in a diesel, i guess i'm with pick on this issue.

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Old 10-16-2006, 03:27 PM   #7
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Quote:
Originally Posted by Pick
If you are going with 5K oil changes, just use Mobil Delvac 1300 15W40, or Chevron Delo 400 15W40. I am sick of wasting time trying to hunt down Mobile 1's Turbo Diesel, and then having to pay $6 a quart for the stuff. I can buy a gallon of dino oil for $2 more. Most of the UOA's I have seen on M1 syn are just about the same as the dino 15W40 oils.
According to the Modil1 website Delvac and Mobil 1Turbo diesel are one and the same???

Different names in different markets??

Confusing...

Ask MobilComparing Mobil 1 Turbo Diesel Truck 5W-40 to Mobil Delvac 1 5W-40

Ask Your Stickiest Question. . . Or ask us something you’ve always wanted to know about using our products. We’ll sort through all the submissions and present the best questions to our automotive experts. The questions, and their answers, will post right here on the site.
Question: Comparing Mobil 1 Turbo Diesel Truck 5W-40 to Mobil Delvac 1 5W-40How does the new Mobil 1 Turbo Diesel Truck 5W-40 oil compare to Mobil Delvac 1 5W-40? Which is better for my 2003 Ford F-350 Powerstroke diesel? -- Greg Braden, Rockford, MIAnswer: Either brand is a great choice since Mobil 1 Turbo Diesel Truck 5W-40 and Mobil Delvac 1 5W-40 are the same product branded differently for different markets.
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Old 10-16-2006, 04:00 PM   #8
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Differences between manufacturers

Quote:
Originally Posted by john hd
i have a 98 6.5 turbo diesel silverado i use as a backup tow vehicle and plowing snow.

15w40 rotella T by shell, about 7 bucks a gallon at most farm stores and truck stops.

i just can't see the advantage in synth oil in a diesel, i guess i'm with pick on this issue.

john
John,
I guess that is one of the differences between the Chevy and Dodge diesel
engines. If Chevy recommends 15W-40 in the heat and humidity of Madison
in January, then they know best. I'll stick with the 5W-40 at least as long
as the truck is under warranty.
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Old 10-16-2006, 04:15 PM   #9
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dave

i normally have the truck plugged in at home and at work. i have started it unassisted in -15 temps. it groaned and the glo plug light stayed on for quite a while but it did start!

at work, all of our internationals fords and some chevs run 15W40 all winter!

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Old 10-16-2006, 04:47 PM   #10
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One of the advantages of synthetics in a diesel is the turbo . The turbo gets it's lubrication and cooling from the engine oil , and the turbo can get very hot. Rotella T also comes in synthetic and you can get it at Wallyworld , more than dino , less than Mobil 1 . To each there own.
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Old 10-16-2006, 07:20 PM   #11
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Quote:
Originally Posted by BillTex
Due for my first oil change at 5k miles. Lots of these miles have been towing. I would like to switch to syn oil but have a couple of ?
  • Some folks claim to wait a little while to break in before switching to syn…if so, how many miles? I always switch my gassers at first oil change.Is it a good idea to switch at 5k miles?
  • Which Mobil1 should I use? I was at Wallyworld and could not find one that said it was for diesel engines?
I am now using Amsoil 15W40 synth with external filters, seems to work fine. I switched from Dello to the Amsoil at 37000 miles. I have found that the engine was just beginning to feel like it was broke in. The fuel mileage kept improving and the power was great at that time. I'm not sure at what time to change but that when I did.
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Old 10-16-2006, 07:45 PM   #12
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I too had to decide whether to use synthetic or dino in my new Duramax. I keep trying to find a definitive answer, but alas no luck.

About when to switch. Some say at 5K, others at 10K, 15K, etc. I would wait until at least 15K so you can procrastinate making a decision. I am certain that waiting won't harm the engine.
About whether to switch. I wish there were a clear winner. There are strong proponents for using synthetics and equally strong proponents for using dino. I've concluded that any of the CI-4 plus 15W-40 dino oils from Shell, Chevron, or Mobil will provide an engine life of 300K miles. I currently use Chevron Delo 400. The temperature here in New England seldom drops below 0 deg F for extended periods of time so I don't see the need to use 5W-40 in the winter.

Now, what about the new CJ-4 rated oils?
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Old 10-16-2006, 08:31 PM   #13
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oil change

Guess I should have been clearer on change interval. I changed to synthetic at 5K miles, and cange every 12K after that. Sorry
Cheers ,, Jeff
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Old 10-16-2006, 08:40 PM   #14
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I'm waiting until 20K to change over if at all. The diesel heads around here tell me if I have the extra money for oil then change it more oftem. Felt kind of silly when they put it like that.
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