Do I need fuel additives? - Chevy and GMC Duramax Diesel Forum
Alternative Fuels - Diesel - Additives - Lubricants Discussion of diesel, its various additives, oils, lubricants and alternative fuels IE: Bio-Diesel ect...

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Old 05-31-2011, 07:37 PM   eBay Motors  #1 (permalink)
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Do I need fuel additives?

Not interested in hearing who has the best additive right now, but I would like to know if I really need fuel additives. The low sulfur diesel does concern me and wanted to hear why (if I do) I need additives. I'm looking for a detailed explanation about pros and cons.

For example: lubricates o-rings and seals, better fuel mileage, etc.

This answer might be different for various types of engines and usage, but I have a 2009 LMM Crew Cab short box 2wd with 20K miles. stock for now, but after 36K will probably put intake and programmer back on.

Let me Restate, this thread is not intended to learn about brands at this time, just to know what is needed and what is not. Thanks in advance!
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Old 05-31-2011, 07:53 PM   eBay Motors  #2 (permalink)
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I do seafoam every two tanks but it is because of my LB7 injectors. You shouldn't need to add any to save anything but it never hurts.
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Old 05-31-2011, 07:53 PM   eBay Motors  #3 (permalink)
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The Ultra low sulfur diesel doesn't lubricate as well as diesel did before they switched to this crap we have now.

This is potentially hard on your injection system. Will it survive without any additives... maybe? is it possibly cheap insurance to run some additives... I fully believe so. Will you get better mileage? possibly a little, but I wouldn't run an additive with that as your primary goal.

There are plenty of good additives out there... one you may consider is two stroke oil. Thats a cheap route. Personally I mix two stroke oil and some other additives together and run them every time I get fuel.

Here is a good read for you when you start researching what additives specifically you want to run: Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums
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Old 05-31-2011, 08:07 PM   eBay Motors  #4 (permalink)
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I agree with GeneralTJI, it is cheap insurance to ensure you are doing what you can to protect your investment. That said, I don't necessarily agree with straight up 2 stroke oil. While it will provide the lubrication, it does nothing to ensure you are keeping the fuel system clean. A clean injector provides a proper spray pattern. When you have a proper spray pattern, you have a better fuel burn. Now if you go with an additive that has cetane in it you are also improving the combustion of the fuel. When you improve combustion you are improving responsiveness, starting and getting a better burn.

There are a lot of additives on the market. Everyone has an opinion on what works best for them. The study link above is a few yrs old but seems to still be valid. I have tried several of the top products from that list. I suggest you do the same to see what works right for you.

If I can be of assistance in the future, please don't hesitate to ask.

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Old 05-31-2011, 08:53 PM   eBay Motors  #5 (permalink)
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I've never run anything in my truck, however I might consider Stanadyne as it seems to be highly favored by Diesel mechanics out here. I think running it every tank full is a bit overboard though don't you? To me that's like running a bottle of Techron or BG44k (same thing believe it, they are both Techron) in a gas engine at every fill up..
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Old 05-31-2011, 08:58 PM   eBay Motors  #6 (permalink)
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Im using an additive (Power Service) to help lubricate.
I agree try some of the top brands & see which one you liked the best. I did the same & they all seem to be the same. I stick with PS cause I can find it almost anywhere.
I use to use an additive on every other fill up & now I use it on every fill up. (I noticed a diff from every other fill up, to every fill up) As for MPG gain, @ 1st I never saw a gain.
Now with almost 50K miles on the truck I see 1+ MPG, but I think thats due to the truck breaking in more, & more.
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Old 05-31-2011, 09:04 PM   eBay Motors  #7 (permalink)
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As others have stated...cheap insurance.
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Old 06-01-2011, 05:49 AM   eBay Motors  #8 (permalink)
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With additive, I've noticed the engine is quieter and a lot less smoke when you first push on the go fast pedal Similar to which type/brand of oil you run, experiment a little and find what works best for you
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Old 06-06-2011, 01:15 PM   eBay Motors  #9 (permalink)
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Over the road guys are having injector problems (seizing) without additives. The owner-operators use it as insurance and they won't spend a dime till they absolutely have to. They use the hell out of Howards in winter above I-70. Use additive for your injectors. My injectors are very quiet compared to other LLY trucks.
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Old 06-06-2011, 01:40 PM   eBay Motors  #10 (permalink)
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Good info to consider. Thank you. I think I'll be playing it safe when I pick up my 08 again this coming thursday.
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