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Maintenance & Fluids Discuss products, techniques, intervals, and fluids for maintaining your GM truck including oil and oil additives, fuel and fuel additives, alternative fuels (Bio-D, SVO, WVO), filters, grease, and maintenance specific tools.

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Old 07-25-2019, 05:14 PM   #1 (permalink)
david1012
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oil ?

2019 Duramax 2500hd

is Amsoil 15w-40 heavy duty diesel oil approved for this engine.. thx, new to diesel's.

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Last edited by OkDually; 07-25-2019 at 06:07 PM. Reason: sig
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Old 07-25-2019, 05:24 PM   #2 (permalink)
chevmen
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It would tell you the specification in your manuals. 15w 40 good for the summer. In winter they recommend 5w40 because it is thinner for the cold weather. But just check your specs in the manuals they gonna tell you.
cheers

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Old 07-27-2019, 01:14 AM   #3 (permalink)
D.Camilleri
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moved to maintenance and fluids
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Old 07-27-2019, 09:47 AM   #4 (permalink)
Rvn4me
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Amsoil 15w 40 API CK-4, CJ-4, CI-4+, CF

You do know where to look for API on containers?

Yes, Have you read your (Duramax Diesel Owner’s Manual Supplement) Page 127
Engine Oil (6.6L 8-Cylinder Engine)

Engine oils with the letters CJ-4 or CK-4 are required for your vehicle. The CJ-4 or CK-4 designation can appear either alone or in combination with other American Petroleum Institute (API) designations, such as
API CJ-4/SL. These letters show API levels of quality. To determine the preferred viscosity for your vehicle's diesel engine, see Engine Oil page 91.

Last edited by Rvn4me; 07-27-2019 at 10:09 AM.
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Old 07-27-2019, 10:23 AM   #5 (permalink)
diesail
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I toyed with Amsoil long ago and it IMO it is snake oil. The made a lot of claims including being better than this rating or that but did have the certifications to back up the claims with excuses of it being a long expensive process bla bla bla. Maybe things a different now, but bottom line for me is if it doesn't have this with all the right alphabet soup on the label



I say no thanks.
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Old 07-27-2019, 12:44 PM   #6 (permalink)
Ted White
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Oil changes are INCLUDED for the first two years so you don't need to worry about oil yet.
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Old 07-27-2019, 04:07 PM   #7 (permalink)
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2 each total oil changes included in first 2 years. I change my oil at 5000 miles / or 6 months, 1 at home, 1 at the dealer for the 1st 2 years. Don't forget to have the dealer grease the 9 grease zerks on the front suspension, they won't do it unless you ask!
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Old 07-27-2019, 04:47 PM   #8 (permalink)
Ted White
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Everyone is free to spend their own money however they want, but if you were to send an oil sample for analysis at a place like Blackstone Labs you would see that changing the oil any time before the oil monitor says to do it is actually a waste of money.

All of my Blackstone Lab tests since 2008, on 5 different trucks up to model year 2019, have all shown that there is at least 10% life left in the oil even when the oil monitor reaches zero at 12,000 miles or more.

Besides which, when has a dealer ever asked you whether you EVER changed the oil when you do a trade in?? Changing the oil at 5000 miles was important in the 1950s and 1960s, but today's oils and engines can EASILY go 12,000 miles between changes.

I'd rather spend my money on something else than oil changes that I don't need to do.

Do a lab test and prove me wrong.
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Last edited by Ted White; 07-27-2019 at 04:48 PM. Reason: Add a few words
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Old 07-27-2019, 04:56 PM   #9 (permalink)
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Here's a link to a YouTube video of a GM chemical engineer talking about the myth of mileage specific oil change intervals

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Old 07-28-2019, 02:30 PM   #10 (permalink)
RDP
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I agree with you that if you drive your vehicle everyday that the oil is still good, but I also personally believe that the if your vehicle sits for 3-10 days between uses like mine that the contaminates stick to bottom of the pan and other areas where the oil pools causing a buildup of contaminates on the surfaces. Short trips in a vehicle when the engine never gets up to operating temperature is a extreme service condition that I think requires more frequent oil changes. Kinda like why I change the oil in my lawn mower in the fall before storing it. I appreciate your input and comments.

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