What's everyone using for fuel treatment on the duramax?
😂😂 too funny.... that filler flapper spring does have a tendency to cause that! I’m gonna try one of these screw on nozzles the wife bought a bunch of. Seems to be stiff enough to go thru the flap and it’ll store in the opti box and hopefully not stink too much...Bought a small funnel from autozone. I insert it into the useless funnel. That way the useless funnel doesn't go into orbit when you're trying to fill.
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I'm not against using it - Costco moves a ton of diesel, so you're pretty much assured that you're not getting a tank of old fuel - similar to what you'd get at a truck stop.. However it could also be that the other sources you have at your disposal don't move much diesel, and so perhaps what you have to compare Costco diesel to is not very good. Either way, the fact remains that it's the same diesel, but just with different additive packs which are mixed in when the fuel is transferred to the delivery trucks. If you're seeing a benefit from it, then the question is either the above scenario, or what is different about Costco's treatments that they're using that the others don't use? I'm betting it's ACDelco's treatment - there's just no other reason why GM would promote it over others.It's definitely not a scam in my truck. When I use anything but Costco 'Top Tier', my engine has a definite diesel clatter, really noticeable on light throttle from takeoff. Adding Optilube 'summer' helps, but it doesn't fully eliminate the clatter. With the Top Tier there is no clatter whatsoever; sounds like a gas engine. Not exactly a definitive scientific test, but it was an eye-opener for me. Wish the stuff was available more places.
I was a little bit concerned until I read about the clatter in one of the forums. A poster had asked his dealer about it, was assured that it was normal diesel noise. Mine definitely comes and goes with different fuel fillups, nonexistent with the Top Tier from Costco.Also, I don't have the issue you're seeing at all, and I too have the 3.0L Duramax. I don't hear this as a common complaint - first I've heard anyone mention it actually.