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Old 10-16-2006, 09:21 PM   #15
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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
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Old 10-17-2006, 05:19 AM   #16
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Quote:
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
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Old 10-17-2006, 07:09 AM   #17
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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
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Old 10-17-2006, 07:40 AM   #18
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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?
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Old 10-17-2006, 08:46 AM   #19
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Quote:
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.
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Old 10-17-2006, 08:58 AM   #20
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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"!
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Old 10-17-2006, 09:44 PM   #21
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Exclamation Duramax oil change

Most GM trucks have the "oil change" reminder and with Onstar you will be alerted via email when service is due.
Syn oil (Mobil 1 Trk/SUV or Castrol) is good. For warranty purposes, it is important to use the specified weight as noted on the oil filler cap. In addition, if you have an Allison trans, the owner's manual instructs you to change the external trans filter on your first oil change. It sells for $33 at the dealer but is less expensive at Napa.

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Old 10-18-2006, 06:59 AM   #22
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Quote:
Originally Posted by lsinclair
Most GM trucks have the "oil change" reminder and with Onstar you will be alerted via email when service is due.
Syn oil (Mobil 1 Trk/SUV or Castrol) is good. For warranty purposes, it is important to use the specified weight as noted on the oil filler cap. In addition, if you have an Allison trans, the owner's manual instructs you to change the external trans filter on your first oil change. It sells for $33 at the dealer but is less expensive at Napa.

Larry
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Hi Larry. just a note; Mobil1 for Truck/SUV is not rated for diesel engines.
I think the Castrol is a blend? Not pure syn?

Also first oil change is due at 5k miles, not in accordance with the DIC. Many folks even change out sooner for the first one. My last two Suburbans I changed out (to Mobil 1) at 1k miles. As the diesel is 10qt, I waited a little longer!

I ususally do my own maint, except for the initial break-in. Just gives me a better feeling to have the dealer ship look things over. Going forward I will follow the DIC. With the gas Suburbans, running Mobil1, I found I got about 7k-8k between OCI's following the DIC durring tow season. A little longer in the winter.
p.s.The dealer charged $27 for the Ally filter yesterday...
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Old 10-18-2006, 08:37 AM   #23
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I have run both Mobil 1 syn and Mobile Delvac 1300 in my Duramax and have done oil analysis with both oils. My conclusion is the 1300 dino is just as good as the syn, for all practical purposes. I run my oil about 7500 miles, so I do not see an advantage to filling the sump with $60 worth of syn oil versus $20 worth of dino in my application. Currently I have 6 qts of Mobil 1 syn and 4 qts of 1300 in there.
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Old 04-22-2009, 04:53 PM   #24
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quick oil drain valve

If you change the oil yourself, using this small equipment helps saving your time a lot. I bought one at qwikvalve.com. Worth to give it a try
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Old 04-22-2009, 05:37 PM   #25
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I would reccomend doing your first oil change well before 5000 miles. Keeping in mind, I dont know your Vehicles MFG date but the oil is at least that old. If you vehicle is at its model year end, it is already overdue before you purchased it.

To many oil changes isnt a bad thing. I ussually dump mine when I get it home. I use Castrol GTX for the first 2. They are done within the first 1500 miles. Then I switch to Mobil 1. I do it every 5000 on synthetic, then I can rotate my tires at the same time.

I have used this system for gas / or diesel engines. Keep in mind a good oil filter is just as important. Mobil 1 also makes a good filter. I am not a big Fram person. They bypass way to early circulating dirt and other grit causing premature wear. An old name I would also reccomend is Hastings. They also make Federated brands.
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Old 04-22-2009, 06:36 PM   #26
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I change at 10K, with Shell Rotella SJ grade synthetic, it's what I use in my fleet diesels too. cost is reasonable, and meets all requirements. I change the fuel filter at 10 also, WIX gold filters in both applications
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Old 04-22-2009, 08:15 PM   #27
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Well since Bill Tex kicked over the ant hill . I'll add my 2 cents.
I have used Shell Rotella 15-40 for at lease several MILLION miles, IN I care not to count how many Cummins engines over 45 yrs of ownership and driving for other people. I have never lost and engine even with a million miles on em.
In my 7.3 liter International Harvester (Ford) I still use Shell Rotella 15-40 year round. I change oil and filters every 10K miles .I am now at 75K and my engine does not require adding of oil between changes.
For Me I cannot justify the extra cost of a Synthetic Oil.
What works for me might not work for someone else. So I will continue doing what works for me.
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Old 04-22-2009, 11:05 PM   #28
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Quote:
Originally Posted by lsinclair View Post
Most GM trucks have the "oil change" reminder and with Onstar you will be alerted via email when service is due.
Syn oil (Mobil 1 Trk/SUV or Castrol) is good. For warranty purposes, it is important to use the specified weight as noted on the oil filler cap. In addition, if you have an Allison trans, the owner's manual instructs you to change the external trans filter on your first oil change. It sells for $33 at the dealer but is less expensive at Napa.

Larry
Pagosa Springs, CO
'05 Classic 25'
'05 GMC 2500 Duramax
Larry... You can pick up the spin on Allison transmission filter # 29539579 for approximatly $15.78 at a Allison Transmission dealer. You can get the location of your local dealer at Sales & Service Locator: Allison Transmission
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