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Old 10-10-2007, 11:40 PM   #1 (permalink)
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Question Best Oil

Hello, this is my first diesel, '07 2500 5.9 auto ( traded in the Hemi ) Love it! Question: It just turned 5000 km and I'm itch'n to change the oil. It doesn't call for it until 12000 km, but this seems like a long time to me since I have always done my oil changes at 5000 km. How often do you guys change your oil? Also, I was thinking of using Royal Purple Synthetic. Is this good oil? What are you guys using? Thaks for the help...Diesel Rookie.
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Old 10-11-2007, 12:10 AM   #2 (permalink)
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i do my oil changes on my Powerstroke every 10K and filters every 5K...im using Amsoil 5w-40 oil !!!
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Old 10-11-2007, 06:58 PM   #3 (permalink)
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a few ?'s

what are you using the truck for? are you looking to go with extended drain intervials?

with that said diesels make soot which makes the oil black. dont let that fool you. if you start with a good quality oil it can last you tens of thousands of miles. its basicly how you feel if you dont feel good about long drain intervials or you like to change your oil every 3000 miles then i would say to buy a less expensive oil. if you like the idea of not haveing to change your oil very offten and maybe checking it with oil analysis id say go with amsoil or mobil 1 or the like.
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Old 10-11-2007, 07:12 PM   #4 (permalink)
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In my opinion Its Amsoil 15w40 20,000 miles on the same oil with a bypass kit and still going strong. Oil analysis tells all.

John
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Old 10-11-2007, 07:12 PM   #5 (permalink)
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I use amsoil. But how many miles on the truck? In my opinyon you dont want to start using a full synthtic to soon. It wont let it break in properly. Just my .02
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Old 10-11-2007, 07:37 PM   #6 (permalink)
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i have heard that myth too. and all i can tll you is that at 2500 miles or so i switched to synthetic and at about 4000 my front main seal was leaking. do they have anything to do with each other who knows.
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Old 10-11-2007, 07:40 PM   #7 (permalink)
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A bad seal is a bad seal. With the additives in synthetics now a days they swell seals as good as any oil out there if not better. Switched mine at 207,000 miles and i had and still have no leaks

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Old 10-11-2007, 07:44 PM   #8 (permalink)
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10-4 good buddy

my thoughts too.
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Old 10-20-2007, 11:55 PM   #9 (permalink)
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Quote:
Originally Posted by mastiffman View Post
Hello, this is my first diesel, '07 2500 5.9 auto ( traded in the Hemi ) Love it! Question: It just turned 5000 km and I'm itch'n to change the oil. It doesn't call for it until 12000 km, but this seems like a long time to me since I have always done my oil changes at 5000 km. How often do you guys change your oil? Also, I was thinking of using Royal Purple Synthetic. Is this good oil? What are you guys using? Thaks for the help...Diesel Rookie.
I bought my truck used and changed the oil to this after talking with a guy on TowRig Forums.

American Clean Energy | Home

They mixed me 12qts of 15W40 oil and I bought a gallon of their fuel additive. Be sure to read the testimonials page and the field support tests page.

Mastiffs are great dogs I have a 100lb pit bull.
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Old 10-21-2007, 12:07 AM   #10 (permalink)
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i bought my 3500 about 3 months ago and did my first iol change with rotella t and no more than a 1000 miles later my rear main seal blew out, litteraly. the dealer said it was barely hanging on. but anyway it has always been changed at the dealer by the previous owner for 68k miles then i change it and the seal goes. did i do something wrong or am i just the lucky one to get to replace the seal?
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Old 10-22-2007, 10:51 PM   #11 (permalink)
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Mastiffman,

Since you are using KM's, my guess is that you are from Canada. I don't know the conversion factor of km's to miles but, if you stay within the factory recommended intervals, you should be fine. Also, you will maintain your engine, new truck warranty.

I was changing oil at 5000 mile intervals & started bumping it up using used oil analysis to verify that the oil was still in good, usable condition. My last oil change was at 9626 miles & the oil was still in good, useable condition (Chevron Delo-400, 15w-40, CI-4+). This was done just short of one year in the crankcase. I believe you have to change, at least, on an annual basis, no matter how many miles on the oil, to maintain warranty.
The "new" oils are now a CJ-4 rated product. Many people feel that the latest formulation is not as 'robust' a product as the previous CI-4+ oil. The CJ-4 is designed for the newest engines with all the emissions stuff & the ability to use ONLY ULSD fuel. It is supposed to be "backwards compatible" however, it does not SEEM to be able to deal with the higher levels of sulphur & the acids that build-up from combustion & high sulphur fuels. It doesn't SEEM to have the additives to deal with higher levels of nitric acid, etc. There is still a lot of LSD available, at least in my area of the country.

On the other hand, some people have run the newer oils, especially the Shell Rotella, for 10,000 mile oil change intervals, tested the oil using used oil analysis & found the oil to still be in good useable condition. So, the new oils may be stronger than many of us think they are.

Once I have to start using CJ-4 oils, I will reduce the miles on the oil changes &, again, start doing used oil analysis to see what condition the oil is in. That way, I will know how MY engine is doing with the new oils.

The Cummins engines are considered to be pretty easy on engine oil.

Joe F,(Buffalo)
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Old 04-15-2009, 02:11 AM   #12 (permalink)
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I have over 245,400 miles on my truck and have ran rotella 15-40 in my truck for the last 47,000 miles and change my oil every 3,000 miles. Am I doing it right or should I change up what I am doing.
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