Duramax oil change

[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?

[jcanavera]

If it was my truck I would consider this Mobil1 product.

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

Jack

[claybags]

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.
Cheers, Jeff

[sander17]

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.

[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.

[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

[BillTex]

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.

[sander17]

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.

[john hd]

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!

john

[ticki2]

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.

[Janets Husband]

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.

[hiker]

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?

[claybags]

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

[Over59]

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.

[BillTex]

I have run syn in my gassers for a long time. Got rid of the "piston slap" in the small block GM engines...

One of my motivations for running syn oil is longer intervals between changes. Other than that, I agree, if you are religious about changes and use quality oil, there probably is not much advantage to syn oils.

I am still confused about the Delvac/Mobil 1 for Turbo Diesel info on the mobil.com site. This is confusing. Is Delvac synthetic?

Thanx, Bill

[hiker]

Originally Posted by BillTex

I have run syn in my gassers for a long time. Got rid of the "piston slap" in the small block GM engines...

One of my motivations for running syn oil is longer intervals between changes. Other than that, I agree, if you are religious about changes and use quality oil, there probably is not much advantage to syn oils.

I am still confused about the Delvac/Mobil 1 for Turbo Diesel info on the mobil.com site. This is confusing. Is Delvac synthetic?

Thanx, Bill

I think OldDog's post in the folllowing Diesel Place thread is correct

http://www.dieselplace.com/forum/sho...mobil+1+delvac

Mobil Delvac 1 5W/40 CI-4 plus used to be Mobil's synthetic for trucks. Mobil probably wanted to give Mobil Delvac a stronger tie to the strong brand name "Mobil 1" so they changed the name from Delvac to Mobil 1. They must have gone through a few false starts creating a lot of confusion. If it's 5W/40 and CI-4 plus and says Mobil then its probably the same oil

[BillTex]

Thanx Hiker, yeah that seems to be the case. I could only find Delvac 1300 (Dino oil) and I had an appt at the dealer today, so I guess I'll be running that for a while. I'll keep looking for the Mobil 1 TBD Syn for next time. Went to 3 places last night. All they had was Delvac 1300...gotta say the Mobil website is confusing...

Mobil Delvac 1300 Super is 15W40 diesel dino oil (good dino oil)

Mobil Delvac 1 is 5W40 diesel synthetic oil (good syn oil)

Mobil 1 Truck & SUV USED TO BE 5W40 synthetic oil and good for diesel

NOW Mobil 1 Truck & SUV is 5W30 synthetic oil and NOT FOR DIESELS

Mobil 1 Turbo Diesel is the new synthetic for diesels

[hiker]

I think the next decision for us diesel owners will be whether/when to switch to the new API CJ-4 rated diesel oil that is supposed to be available sometime this month. API CJ-4 oil will be required in model year 2007 engines. The claim for pre-2007 engines is that API CJ-4 oil will provide better protection, including improved wear protection, high temperature oxidation control and soot handling which will enhance engine durability and cleanliness of the engine.

But I'm not sure. Is this marketing hype or real? Will other forum members be switching? Any opinions?

[sander17]

Originally Posted by BillTex

Thanx Hiker, yeah that seems to be the case. I could only find Delvac 1300 (Dino oil) and I had an appt at the dealer today, so I guess I'll be running that for a while. I'll keep looking for the Mobil 1 TBD Syn for next time. Went to 3 places last night. All they had was Delvac 1300...gotta say the Mobil website is confusing...

Mobil Delvac 1300 Super is 15W40 diesel dino oil (good dino oil)

Mobil Delvac 1 is 5W40 diesel synthetic oil (good syn oil)

Mobil 1 Truck & SUV USED TO BE 5W40 synthetic oil and good for diesel

NOW Mobil 1 Truck & SUV is 5W30 synthetic oil and NOT FOR DIESELS

Mobil 1 Turbo Diesel is the new synthetic for diesels

Note to add: the Mobil 1 Turbo Diesel is 5W-40. with the CI-4 rating
according to the Mobil website. I suspect they will update it to CJ-4 soon.

[BillTex]

I suspect the new as the new oils hit the market to meet CJ-4 that they will replace (not supplement) the oils meeting CI-4 so we really won't have a choice. But as stated they will be "new and improved"!