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25000 miles on the d-max. i have changed fluid every 3,000 miles at the gm dealership where i puchased it. i have decided to do it myself and heard and read that can easily go 5000 miles between changes. does anyone know what oil gm dealerships use for the d-max and any suggestions on engine oil to use.???
 

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If you buy the case of oil from the dealer it will be GM Goodwrench. Dealer could be Valvoline, Mobil, Private Label and hopefully not Penzoil. The dealer buy oil in bulk and have a hose reel dispenser that puts the oil in your crankcase with what ever oil they decided to buy. Usually a midgrade oil with a good price point.

Also you can probably go more than 5500 miles depending on your driving conditions. Oil change is also easy and your have the fun time of doing ti yourself.
 

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I'd say go to wallyworld and get some Rotella 15w40 and do it at 5 to 7.5 k. You can't go wrong with it. While your getting the oil, DO NOT BUY A FRAM FILTER! Get a 2232 AC or anything else, but Fram is CRAP. There's a reason they cost less than half of anybody else's filter.
 

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pennzoil

BigBadAllis;1560721; said:
If you buy the case of oil from the dealer it will be GM Goodwrench. Dealer could be Valvoline, Mobil, Private Label and hopefully not Penzoil. The dealer buy oil in bulk and have a hose reel dispenser that puts the oil in your crankcase with what ever oil they decided to buy. Usually a midgrade oil with a good price point.

Also you can probably go more than 5500 miles depending on your driving conditions. Oil change is also easy and your have the fun time of doing ti yourself.
There is absolutely nothing wrong with Pennzoil. I have been using it in all my trucks for years. It is a very good oil.
 

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Gman66;1561326; said:
There is absolutely nothing wrong with Pennzoil. I have been using it in all my trucks for years. It is a very good oil.
Diesel oil? Even the distributors have a hard time convincing themselves to sell it. Gas oil your fine, but the diesel 15/40 is not good for your engine. Very high parafin content and not enough detergent.
 

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i recommend amsoil. just my opinion.
 

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BigBadAllis;1561737; said:
Diesel oil? Even the distributors have a hard time convincing themselves to sell it. Gas oil your fine, but the diesel 15/40 is not good for your engine. Very high parafin content and not enough detergent.

Yes, Diesel oil. My friend has a 1996 Dodge Cummins with 475,000 miles. Nothing but Pennzoil. Also, his 03 Duramax with 123,000 miles, Pennzoil all the way. Not one issue with the engine. Now with my 07 LBZ I will use Pennzoil. I have used it in my trucks also and never had any issues. I think people get a little carried away with motor oils today. Any 15/40 CI4 rated oil will serve your truck for a long time.
 

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Last I checked the GM badged oil was made by Mobil1. Personnally I run Amsoil with their dual bypass filter system. Last oil change was 15,500 miles due to fuel contamination from a bad injector. All other elements were well within specs to keep running. BTW my CAT dealer only charges $12 for the oil analysis. I was just noticing the drop in fuel mileage and it hadn't started smoking yet when I pulled the sample. I found my failed injector much sooner with the oil analysis than I would have.
 

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My truck came with 3 "free" oil changes. The service guy was carrying a case of Rotella to my truck before he took it to the shop.
 

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Gman66;1561326; said:
There is absolutely nothing wrong with Pennzoil. I have been using it in all my trucks for years. It is a very good oil.
Gman66;1562200; said:
Yes, Diesel oil. My friend has a 1996 Dodge Cummins with 475,000 miles. Nothing but Pennzoil. Also, his 03 Duramax with 123,000 miles, Pennzoil all the way. Not one issue with the engine. Now with my 07 LBZ I will use Pennzoil. I have used it in my trucks also and never had any issues. I think people get a little carried away with motor oils today. Any 15/40 CI4 rated oil will serve your truck for a long time.
:exactly:
 

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Schaeffer oil for me.Was always a Rotella T man until a year or so again.Oldest oil co. in the country--started 1839--they have the moly propietary formula down pat--great stuff.I run their dino 200X---syn. in my axles.
 

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I would go by the oil change indicator. The computer will calculate it for you. Its based on how hard you work it.

If you dont drive the truck often or its a short trip truck then I would change it early or if you flog the crap out of it and have any mods. Otherwise just do it when it tells you. Probably be around 7k miles or so......

Or go to synthetic oil and go to extended drains. You still change the filter when it tells you too but you keep the oil in the motor longer.

In a conventional oil any of the big names will work well. Shell, mobil, valvoline etc. Stick with an oil that at a minimum meets the required specs.
 

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My stealership usea rotella 15/40 by the gallon jugs.
 
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