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Discussion Starter #1
I just got my oil and filter changed at the GM dealer. While I think they used the correct oil, when I look it up some places say not for Duramax engines while others when I put in my VIN it says doesn't fit your vehicle.

They put in 6 quarts of GM 19354306 which when I look it up says it's ACDelco Dexos2 5w-30 full synthetic. Seems right but can't seem to find anyplace to confirm. Just want to make sure I have the correct oil in it.
 

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Looks right to me. Dexos 2 is the important part to protect the dpf. 5w-30 is the weight for most climates, though I'm sure someone here will say their frozen tundra requires the 0w-40 weight.

Would be nice IMO if I could find a 5w-40. Seems the best balance of extra thick to protect but not congeal in 30° F temps.
 

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Discussion Starter #3
Looks right to me. Dexos 2 is the important part to protect the dpf. 5w-30 is the weight for most climates, though I'm sure someone here will say their frozen tundra requires the 0w-40 weight.

Would be nice IMO if I could find a 5w-40. Seems the best balance of extra thick to protect but not congeal in 30° F temps.
Yeah, it looked right to me. I did do some searching for oil change kits and the ones that had ACDelco oil used the same part number. My thoughts is that the "not for Duramax" was probably a statement for the 6.6.
 

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Smart searching 6speed, and thanks. It's bookmarked....
Your welcome.
My preference is Pennzoil euro L. Simply because it's easily available at your local Walmart and it's inexpensive. Pennzoil has improved it's reputation quite a bit from the 90's when they had oil issues with engine build up.
 

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This is the only oil I use in my truck and VW (anything with DPF). I also use Hotshot’s Secret Stiction Eliminator and Fr3 oil additives. Those combos won’t disappoint.

Mobil 1 (103469-12PK ESP Formula 5W-30 Motor Oil - 1 Qt, (Pack of 12) https://www.amazon.com/dp/B00LWUWP6O/ref=cm_sw_r_cp_api_i_WZFKFb467RC5J
Would you please link us to any 3rd party testing that shows us how this additive package helps performance/longevity? Kudos on the oil choice though....
 

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Would you please link us to any 3rd party testing that shows us how this additive package helps performance/longevity? Kudos on the oil choice though....




 

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Discussion Starter #11
For me I generally have never used any oil additives but instead change the oil frequently. My last old diesel I changed religiously every 2500 miles with conventional Rotella and just sold it with over 300K and it still runs like new with good oil pressure. With the 2.8 I'll change every 5000 (regardless if DIC saying I have more life) and I too will use Mobile 1 synthetic. I'm always up in the air about adding stuff to the oil for some reason.

As for fuel additives I feel everyone should use something. Regardless of how the injector pump and injectors are made there simply is no lubrication in ULSD. I am interested in any additive that would reduce regen cycles. On straight highway I'm pretty good averaging like others at a regen about every 500+ miles. Around town I'll regen frequently about every 125-135 miles and about the same when towing. I've always used Standyne fuel additives but I may have to give Hot Shots a try. If it reduces regens I'm sold, if not I'll stick with Standyne.
 

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Thanks for these, but they appear to be paid up reviews from the product manufacturer. Do you have any true 3rd party reviews of either this product, from an organization in the biz of investigating these claims, such as SAE, ASTM. Consumer Reports, etc, for either this product or for any other that claims economic benefits from reducing regen cycles? I looked myself, unsuccessfully.

Wouldn't you think that, if they worked as promised, then GM would cash in with their own products? FYI, they don't and recommend that you use NO such additives.....
 

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Discussion Starter #13
Wouldn't you think that, if they worked as promised, then GM would cash in with their own products? FYI, they don't and recommend that you use NO such additives.....
Actually GM says you don't need it but if you wish to use an additive they used to suggest Standyne. Now I believe GM does sell their own additive, again, if you wish to use one. I think the prevailing wisdom is that the GM product is private label Standyne. This info was discussed in another thread.

Agree on the independent verification. If in fact this was tested with the Columbus busses and they saw such a dramatic drop in regens I'd think it would be pretty easy to verify ourselves. Highly doubt it's going to damage anything using Hot Shot. I think lots of people doing limited driving with COVID and most of it being local, it would be pretty easy to verify if local driving regens began to extend past the 135 mile range. I'm fairly happy with the regen cycle on straight highway, it's the around town regens at about 135 miles that drive me nuts! Planning a 500 trip to North Carolina in 2 weeks so maybe I'll plan to test it out then.
 

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Actually GM says you don't need it but if you wish to use an additive they used to suggest Standyne. Now I believe GM does sell their own additive, again, if you wish to use one. I think the prevailing wisdom is that the GM product is private label Standyne. This info was discussed in another thread.

Agree on the independent verification. If in fact this was tested with the Columbus busses and they saw such a dramatic drop in regens I'd think it would be pretty easy to verify ourselves. Highly doubt it's going to damage anything using Hot Shot. I think lots of people doing limited driving with COVID and most of it being local, it would be pretty easy to verify if local driving regens began to extend past the 135 mile range. I'm fairly happy with the regen cycle on straight highway, it's the around town regens at about 135 miles that drive me nuts! Planning a 500 trip to North Carolina in 2 weeks so maybe I'll plan to test it out then.
"Actually GM says you don't need it but if you wish to use an additive they used to suggest Standyne."

Is this written down anywhere?

"Now I believe GM does sell their own additive, again, if you wish to use one. "

I agree. Thanks for that, and I stand corrected. My info was ~2 years old, from visiting my local dealer, and the dealer I bought from. Here's what they recommend.

 

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Discussion Starter #15
"Actually GM says you don't need it but if you wish to use an additive they used to suggest Standyne."

Is this written down anywhere?
From conversations here I think it was written in the older truck diesel supplemental books. It for sure is written in the 6.6 diesel manual. I don't have the diesel supplement for my truck (2017) so I can't check myself (wasn't in the glove-box when I bought the truck used). It's possible it was in an older tech-link before they started selling their own additive. If memory serves Standyne is the only manufacturer listed by name from GM. It was mentioned in my 1999 6.5 TD Suburban diesel supplement. I don't know for the Duramax's but the injection pumps for the 6.2L and 6.5L diesels were manufactured by Standyne. I think with the 6.2/6.5's when LSD and ULSD came out and those pumps were plagued with pump failures due to low lubricity fuels GM started recommending additives. My 1999 pump was made for LSD but not for ULSD. Engine had Standyne Performance used in every fill up since new and I started additionally adding Standybe Lubricity when ULSD came out, 300K miles and the original IP is still pumping away.

Funny regarding Top-Tier Diesel. From previous discussions this is not widely available. I had thought "Top-Tier" stated all fuels sold must be top-tier but someone pointed out that stations listed as "top-tier" distributors must only sell top-tier gasoline to state they are top-tier. Top-tier Diesel is something else. Either way, top-tier diesel or not, I'd still use an additive anyway.

I ordered some Hot Shots Diesel Extreme Clean from Thoroughbred Diesel because with the order they also included a 4oz shot of Everyday Diesel Treatment which will treat 4 fill-up's in our trucks. I plan to try it out and log regeneration cycles to see if it actually makes a difference. I'll report back. I'd imagine after the deep clean with Extreme and 4 additional fill-up's with EDT I should se a difference if it's going to make one. If it doesn't I'll return to using tried and true Standyne.
 
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