Cummins Diesel Forum banner

Using the ATF/2SO mix from day 1, long term report

15K views 49 replies 14 participants last post by  Alcharger  
#1 ·
Starting this thread to provide updates as needed for using the ATF/2SO mix (see newbies guide post #1 for details) on the current set of injectors from day 1 at approx 325k miles.

The trucks background...
Truck is a daily driver, does not tow, do not haul anything heavy on a regular basis (dirt & rock when needed), it gets me from point A to point B.

The background story...

Original Injector Set: Owned this truck since 13.5k on the clock, 1st set of injectors showed problems early on and often. Cant say at what mileage it started as I never documented it. What I can say is they were a problem to the point where I swapped them out at 160~165k miles. They lived their life on the Power Service Diesel (white bottle). Along the way I gave MMO a shot to clear out a problem and it worked well. So well that I started adding it to the PSD in small amounts (again cant say how much, its been too long).

Second Injector Set: Installed Industrial Injection 60 hp injectors. Ran them with the same mix I'd been using, PSD & MMO. With that mix they seemed to be doing OK, better than the 1st set overall but, at 120~125k miles I had a problem. On a road trip a rattle occurred that I could not get rid of with any additive I tried. Only one fuel actually made it a tad bit better but ultimately I re-tuned around it. This is where I first started reading about ATF in the fuel.

The ATF fix...

After the 2000+ mile road trip and attempting everything I knew to clear the injectors I had decided to send it off to a shop for diag. Expecting the call stating I need new injectors and feeling like I had nothing to loose I went and got a bottle of ATF type F and dropped in 16 oz to a 1/3 or so of a tank and motored on to work. At work the plan was to call the shop, to truck and send it on its way (rental car place was next to work). Before the phone calls I took it for one last spin to verify rattle was still there (very nasty rattle) and put the truck back to stock.

The next day around noon I get a call from the shop (Dynomite Diesel Performance) and they state there is no problem found. "Say what???!!!" and they ask me to come over and go for a drive with the tech. When I get there I'm told they fired it up and let it idle for 30ish minutes until it was warmed up and then took it for a test drive. They found no rattle and suggested a ride with the tech so he can hear what I hear. On the drive I got it up to temp and sure enough, no rattle. WTH!!!! I told him the background story as to why the truck was there and he commented that the ATF may have cleared the injectors. He suggested a valve adjust as the only action at that time. On the way back to work and still in disbelief the truck was clearly running better than it had been before the bandaid tune I stuffed in there. The more miles I put on it the better it performed. Did the valve adjustment to the then preferred specs of 0.010/0.020 I/E and then went back and re-adjusted to a 0.012/0.022 I/E spec and have been with that ever since. Not long after (30~45 days) is where I started running the mix in a 12oz/20oz dose (ATF/2SO)

Fast forward 30~35k more miles and at 160~165k miles on this set, more injector problems popping up so off to the same shop again for diag. This time they told me they were done (return flow failure iirc) and knowing the problems I had on them I OK'd their 50 hp injectors to be installed (no BBI remans at that time). Miles on the clock = 325k. From day one, they lived on the 8oz/24oz mix on every tank up until around 100k miles where it became every other tank. I have had zero issues with the injectors up to this point. In comes the bet... During the 11 yr makeover of the truck I got into a bet with a co-worker. That bet was for if I could get my 5 best tanks to average 23.0 mpg or better. During that time I stopped using the mix to keep things consistent. What I found was the performance started dropping off and timing rattle started coming back on the best tune I had at the time. This occurred after he lost the bet. Dumped in the mix and within 200~300 miles, rattle gone and performance restored. This is the only time there has been any issue where I point to the injectors and even then, it was my fault for not continuing with the mix.

Today, the mix gets used regularly and generally every other tank if not back to back tanks. Sitting now at 470k miles with approx 145k on these injectors and they are running awesome... Zero complaints and zero problems while using the mix. In approx 3-4 months I should be passing the 160~165k mark and going farther on a set of injectors then ever before. New territory for my truck & injectors, will be keeping an eye on them for sure.

While plenty of others have had success well beyond 200k, I have not and I believe it is because the truck never sees a load for any sustained amount of time.

Will keep this thread updated when I approach the 165k mark and beyond...
 
#2 · (Edited)
Nice writeup @steve05ram360!

I think I read one of your earliest ATF posts and switched my OEM injectors to ATF. Truck may have had 100k on it or so. It has had an inline fuel filter, after the OEM since 35k.

Today, 240k on the clock, injectors show no signs of wear. Contribution tests are 100% across 6 cylinders. At 235k, some smoke and contribution tests showed imbalance. We added 1 quart ATF to fuel and filled the spin on fuel filter with ATF. Also added 1 quart Stiction Eliminator to oil. Issue went away within 1 tank of fuel. We add 8 oz ATF per 30 gallons or so. We fill the spin on fuel filter with ATF when we replace at 10K and do a start/shout off/let it sit overnight to soak the injectors.

We have a 12v, single injector pulse, tune we run when running solo. This is about 80% of the time. Towing +- 10k, we run a canned tow tune. MM3 tuner from Rob.

I watch for the telltale signs of injector failure and will respond.

MPG is right where the truck was new. +-22 MPG highway. Smoke is about the same as when new.

Side note: we replaced all the engine management and fuel sensors/relief valves along with replacing battery power and ground cables improve overall performance, MPG. The entire system needs to be equal or better than new for peak performance.
 
#3 ·
That would be awesome to get to the 240k mark on a set of injectors. I still run pilot and a tad bit of post to get the turbo spooling, most of the time it is a 2 injection event running.
 
  • Like
Reactions: Alcharger
#4 ·
Sorry if I missed it... Are you running any additional fuel filters? If yes, when when were they installed?
 
#5 ·
Yes, 3 micron donaldson 531313 (?) between the OEM filter & the CP3. Installed (I'm guessing) 70~90k miles into the 2nd set of injectors. I can see if I can find the posts where I did the install for a better number. I know it was after the Walbro install in 2011 which was at the 175~185k mark.

You know, if I were better at documenting this stuff it would be easy to find that info :ROFLMAO:
 
  • Like
Reactions: StealthDiesel
#8 ·
Yes, keep those ratios, less is OK to. I dropped down to 8oz/24oz ATF/2SO from time to time when I know there is a good amount of fuel in the tank.
 
#9 ·
I bought mine in November 2018 with 187,XXX on it. It was on a used car lot, so I didn't get any history on the injectors. It would make a slight wisp of white on a cold start, so I expected to need injectors soon. But based on threads here, I've been running 8oz ATF and 24oz 2SO per tank since. I do occasionally run a tank with no additive so that I don't over-mix the fuel. I'm up to 247,XXX miles, the white puff is gone and it runs great. Other than a muffler change, it's bone stock. Very happy with this truck.
 
#10 ·
Congratulations on extra long injector life.

My 06 is just a few thou from yours. Good to see others extending their injector life. I'll post up and hope your do the same, if/when, its time to replace injectors.

BTW, does your truck have additional fuel filtration? If not, then you have an example of getting excellent injector life without an extra fuel filter...
 
  • Like
Reactions: 19 Badger
#15 ·
At this point, I buy non synthetic, cheapest atf on the shelf. With no evidence, I believe the detergent is helping extend the injector life.

Folks say synthetic atf or 2so does not burn well. Funny, 2so is made to mix and burn with gas. I just buy the cheapest 2so.
 
  • Like
Reactions: rgsauger
#19 ·
I wonder why our Cummins injectors, regardless of make seem to last such a short period of time before they start making issues? Our 03 VW Jetta tdi has 290K and has had absolutely zero issues. I have run WVO, biodiesel, and regular diesel over the years and no problem.
I have new BBI .5 injectors in my 05, with about 9k and they have been great. I would like to try the aft/2so mix, but am a bit scared to do so. Yes O5ram, I do trust your testing and results.
 
#20 · (Edited)
I wonder why our Cummins injectors, regardless of make seem to last such a short period of time before they start making issues? Our 03 VW Jetta tdi has 290K and has had absolutely zero issues. I have run WVO, biodiesel, and regular diesel over the years and no problem.
I have new BBI .5 injectors in my 05, with about 9k and they have been great. I would like to try the aft/2so mix, but am a bit scared to do so. Yes O5ram, I do trust your testing and results.
As far as 3rd Gen Cummins, the OEM fuel filter didn't filter to the Bosch injector spec. I added a 2nd filter at 40k.

In my case, 245k on oem injectors, with a secondary fuel filter, 8 oz atf and 8 oz 2so per 30 gals. I fill the spin on fuel filter with ATF at 10k, start and let the aft soak the injectors.

I'm careful to buy fuel at busy stations to avoid a bad tank

06 and up we can check fuel balance on a phone, Alpha OBD, my engine balance was 100 on all holes yesterday. Starts easily with no smoke. No drama truck. It tows or DD like it was new.

2so is not needed on .5bbi injectors. When I replace injectors, bbi.5s, I'll keep the 2nd fuel filter and ATF treadment.
 
#24 ·
Starting this thread to provide updates as needed for using the ATF/2SO mix (see newbies guide post #1 for details) on the current set of injectors from day 1 at approx 325k miles.

The trucks background...
Truck is a daily driver, does not tow, do not haul anything heavy on a regular basis (dirt & rock when needed), it gets me from point A to point B.

The background story...

Original Injector Set: Owned this truck since 13.5k on the clock, 1st set of injectors showed problems early on and often. Cant say at what mileage it started as I never documented it. What I can say is they were a problem to the point where I swapped them out at 160~165k miles. They lived their life on the Power Service Diesel (white bottle). Along the way I gave MMO a shot to clear out a problem and it worked well. So well that I started adding it to the PSD in small amounts (again cant say how much, its been too long).

Second Injector Set: Installed Industrial Injection 60 hp injectors. Ran them with the same mix I'd been using, PSD & MMO. With that mix they seemed to be doing OK, better than the 1st set overall but, at 120~125k miles I had a problem. On a road trip a rattle occurred that I could not get rid of with any additive I tried. Only one fuel actually made it a tad bit better but ultimately I re-tuned around it. This is where I first started reading about ATF in the fuel.

The ATF fix...

After the 2000+ mile road trip and attempting everything I knew to clear the injectors I had decided to send it off to a shop for diag. Expecting the call stating I need new injectors and feeling like I had nothing to loose I went and got a bottle of ATF type F and dropped in 16 oz to a 1/3 or so of a tank and motored on to work. At work the plan was to call the shop, to truck and send it on its way (rental car place was next to work). Before the phone calls I took it for one last spin to verify rattle was still there (very nasty rattle) and put the truck back to stock.

The next day around noon I get a call from the shop (Dynomite Diesel Performance) and they state there is no problem found. "Say what???!!!" and they ask me to come over and go for a drive with the tech. When I get there I'm told they fired it up and let it idle for 30ish minutes until it was warmed up and then took it for a test drive. They found no rattle and suggested a ride with the tech so he can hear what I hear. On the drive I got it up to temp and sure enough, no rattle. WTH!!!! I told him the background story as to why the truck was there and he commented that the ATF may have cleared the injectors. He suggested a valve adjust as the only action at that time. On the way back to work and still in disbelief the truck was clearly running better than it had been before the bandaid tune I stuffed in there. The more miles I put on it the better it performed. Did the valve adjustment to the then preferred specs of 0.010/0.020 I/E and then went back and re-adjusted to a 0.012/0.022 I/E spec and have been with that ever since. Not long after (30~45 days) is where I started running the mix in a 12oz/20oz dose (ATF/2SO)

Fast forward 30~35k more miles and at 160~165k miles on this set, more injector problems popping up so off to the same shop again for diag. This time they told me they were done (return flow failure iirc) and knowing the problems I had on them I OK'd their 50 hp injectors to be installed (no BBI remans at that time). Miles on the clock = 325k. From day one, they lived on the 8oz/24oz mix on every tank up until around 100k miles where it became every other tank. I have had zero issues with the injectors up to this point. In comes the bet... During the 11 yr makeover of the truck I got into a bet with a co-worker. That bet was for if I could get my 5 best tanks to average 23.0 mpg or better. During that time I stopped using the mix to keep things consistent. What I found was the performance started dropping off and timing rattle started coming back on the best tune I had at the time. This occurred after he lost the bet. Dumped in the mix and within 200~300 miles, rattle gone and performance restored. This is the only time there has been any issue where I point to the injectors and even then, it was my fault for not continuing with the mix.

Today, the mix gets used regularly and generally every other tank if not back to back tanks. Sitting now at 470k miles with approx 145k on these injectors and they are running awesome... Zero complaints and zero problems while using the mix. In approx 3-4 months I should be passing the 160~165k mark and going farther on a set of injectors then ever before. New territory for my truck & injectors, will be keeping an eye on them for sure.

While plenty of others have had success well beyond 200k, I have not and I believe it is because the truck never sees a load for any sustained amount of time.

Will keep this thread updated when I approach the 165k mark and beyond...
I know the ATF type F, but What is 2so??
 
#29 ·
Automatic Transmission Fluid

There are some threads on here about using it with 2-stroke oil in your fuel to keep your injectors clean. Has to be non-synthetic Dex/Merc stuff.
 
  • Like
Reactions: steve05ram360
#31 · (Edited)
Looks like i was mistaken, thought the injectors went in at 325k, according to this it was 320k. With that said, this set has 160k on them, now at the same 160-165k miles the first 2 sets were swapped at. Truck continues to run awesome with just the one timing rattle issue during the year of the bet... Which was cleared by.... The atf/2so mix

 
#32 ·
Ok, so I have a picture of the two available DEX/MERC fluids from Walmart below. Both are non-synthetic. I have been using the SuperTech stuff and like it because I use 8oz per tank with 32oz of 2-stroke oil, so a quart and a gallon last me the same number of tanks. However, the price on the Valvoline stuff is enticing because it is about $19 for a gallon vs about $9 for a quart of the SuperTech stuff. Can anyone provide some insight as to which is better than the other?

Image
 
#33 ·
You want the stuff that is equal to dexjjj/merc... The one on the right.

The supertec brand sells out often and is cheaper at around $15 gal
 
#34 ·
Is there an issue using the stuff on the left?

My main reasoning for trying to use SuperTech over Valvoline is that I figured it would have less additives that could potentially cause problems. I figure Valvoline would put more additives in because it’s a better brand.
 
#35 ·
I am not 100% certain the one on the left is a non-syntheric atf, which may have a higher flash point. No idea the effects of using a syth atf would he long term...
 
#36 ·
This is just an observation, not intended to be an authority on the subject. The full Synthetic should not have any long term issues, the cleaning would be equal, it will compress and ignite with the diesel fuel just fine, hell it should do it completely on its own just fine, the higher flash point won't matter when we are talking about the heat inside the cylinder. But using synthetic, or synthetic blend is just wasting money as the benefit of synthetic is the the better quality for your transmission care, here we are not worried about longevity of fluid, hell we are just burning up the fluid.
 
#37 ·
FWIW, these were my last tips after running Power Service Diesel for 120k, then 40k with the ATF/2SO mix (these may be posted in this thread already, I did not go back and check. I looked for the other tips someone else posted years back that looked nasty but could not find them. They were a dooms day pic someone posted. ON mine you can see where the injector holes were cleared out, no idea what they looked like before I started using the mix. You can see a donut shape around some of the holes where I would have expected they were plugged.

Motor performance mile vs mile one to the other... night and day in favor of the mix. Running the PSD just gave me headaches as the miles piled up on it. Daily driver rarely loaded. Currently 163k (?) on the set 483k miles on the truck - 320k the time of install...

Image


Image
 
#38 ·
It's time to change the oil and fuel filters.

I'll prime my fuel filters with ATF, do a short start and let the atf soak a few hours.

I'll report back if there are any changes.
 
  • Like
Reactions: slowmover
#39 ·
I mix mine 1ltr atf, 1ltr tw-3 2 stroke + 2 ltrs diesel. Fill the fuel filters. On a warm engine, install the new filters & dump remaining mix in tank. Start up & let idle for a minute. Shut off & soak overnight. If time allows, start up next day for 1 minute & let soak until next day.
I notice a quieter & better running engine every time doing this.
Every 3rd tank, I will add 1ltr atf + 1ltr TW-3 oil in a full tank of fuel. My BBI 1.0’s have been running good for close to 400k Km’s this way.
 
#41 · (Edited)
That's all encouraging!

When did you start doing the atf/2so/diesel fuel filter priming?
How long did you oem injectors last?

Like you, I prime the fuel filters on a warm engine. I prime the oem and spin on filter mounted on the air horn.

590 hours at 255k miles, original injectors and cp3.
 
#42 ·
Honestly I can’t remember. Probably when Steveram05 posted but who knows.
OEM lasted about 250k Km’s before 1 stuck. Factory fuel system. Installed new DDP 90’s & Fass 165 titanium pump. DDT’s only lasted about 90k Km’s. Failure was a shorted solenoid & 4 solenoids ohming high. Replaced with new BBI & running great ever since. Reman BBI’s weren’t even offered at the time.
best guess would be 8-10 years with the mix
 
#44 ·
Ok
So I have a question I have a stock 04/2500/4wd that I bought new
have always added fuel additives all her life 175,000 on the clock
The more I read the more my curiosity about adding 2 cycle oil or atf…
I had a 1998 Peterbilt that from time to time I’d dump some atf in
So I guess my question is …. Should I add 2 cycle oil to the old girl??
 
#45 ·
Thats up to you to decide...

I love my truck, it has served me well. I learned what it takes to keep it on the road and since becoming the norm, it has out performed the miles before the 2 steps taken by leaps and bounds (engine)