First oil change - Page 2 - Chevy and GMC Duramax Diesel Forum
Maintenance Discuss scheduled maintenace, capacities, filter part numbers, etc.

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post #11 of 17 (permalink) Old 11-28-2012, 10:09 AM
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Originally Posted by jmac5058 View Post
Once a diesel motor is run on synthetic it needs to stay on synthetic. The decision has been made for you.
Why's that?

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post #12 of 17 (permalink) Old 11-28-2012, 10:26 AM Thread Starter
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Originally Posted by Dirtbikindad393 View Post
This is correct and its called OE (Original Equipment) oil and it is rated for the MFG recommended oil change interval up to 10k miles. It comes in 10W-30 and 15W-40 weights. It costs less due to the additive package being less than the 25k mile oil. It is a CJ-4 rated oil so it may be used on newer DPF equipped trucks and is backwards compatible for older CI-4 trucks such as the 01-2007 LBZ trucks. We stock this oil on the shelf so if you have any questions or are interested in the DF member Amsoil special we have PM us or call.

OED 15W-40

OEC 10W-30
Is 15w-40 appropriate? Why woulld you use it over 5W-40?
Will it be harder on mileage or performance?
Will it be suitable for freezing weather?
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post #13 of 17 (permalink) Old 11-28-2012, 11:52 PM
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Originally Posted by s4bill View Post
Is 15w-40 appropriate? Why woulld you use it over 5W-40?
Will it be harder on mileage or performance?
Will it be suitable for freezing weather?
15W-40 is what the manual calls for. So yes 15W-40 is appropriate, remember once its warmed up its all 40 weight if its 5W-40 or 15W-40.

The 5W-40 DEO Amsoil has a cold pour point of -51F, 15W-40 is DME is -41F,15W-40 OED is -38F, 15W-40 AME CI-4 is -44, 10W-30 OEC is -36F, 5W-30 HDD is -58F. So you can see that the operating temps of even the 15W-40 are pretty low. In very cold climates such as Yukon, Northwest Territory, Nunavut and in Alaska a 5W-30 or 10W-30 would be appropriate too. Where temps are -20F or lower for days on end or for multiple nights on end a lighter weight oil is a good thing.


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Last edited by Dirtbikindad393; 11-28-2012 at 11:59 PM.
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post #14 of 17 (permalink) Old 11-28-2012, 11:55 PM
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Originally Posted by jmac5058 View Post
Once a diesel motor is run on synthetic it needs to stay on synthetic. The decision has been made for you.
That is a totally false statement. You can switch back and forth at your leisure. Most people that go synthetic stay with it but I also have many owners that switch to conventional in the spring/summer and use Synthetic in fall/winter.


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post #15 of 17 (permalink) Old 12-02-2012, 04:06 AM
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Originally Posted by Dirtbikindad393 View Post
That is a totally false statement. You can switch back and forth at your leisure. Most people that go synthetic stay with it but I also have many owners that switch to conventional in the spring/summer and use Synthetic in fall/winter.
There are stories of developing ticking syndrom from people that have changed back and forth and thats not totaly false Dirtbagdad .
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post #16 of 17 (permalink) Old 12-02-2012, 01:49 PM
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Originally Posted by jmac5058 View Post
There are stories of developing ticking syndrom from people that have changed back and forth and thats not totaly false Dirtbagdad .
Operative word "stories". There are 1000's of people who go back and forth on a regular basis with no issues Jbagmac. But as I always say I am not the final word on anything and nobody should take my word as the gospel, they need to do their due diligence and research and decide for themselves.


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post #17 of 17 (permalink) Old 12-03-2012, 02:15 AM
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Originally Posted by Dirtbikindad393 View Post
Operative word "stories". There are 1000's of people who go back and forth on a regular basis with no issues Jbagmac. But as I always say I am not the final word on anything and nobody should take my word as the gospel, they need to do their due diligence and research and decide for themselves.
There not just stories Dirt , there are many videos of peoples $50 K trucks rapping like crazy after changing back and forth , to call my statement totaly false sounds like gospel to me. If you dont mind your cam shaft and lifters sloshing around at 20 K miles switch back and forth every fue months is more accurate than your selfrightous statements . Do you switch back and forth winter and summer in your truck ? I dont think so.
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