Hello all who read this. Sorry for it being such a long read.  I have an 08 6.7 2500 4X4 at 448,000 miles standard shift. I am almost stock as in I did a cal delete with the smarty race me pro. I keep it set at the 0 setting for fuel economy and that has worked out well. I went with a dual disc clutch when the stocker failed and started to slip under load. I also am using a K&N air filter in the stock airbox.  I use my truck for moving travel trailers and a daily driver. The truck developed a vibration some time ago. First thought it was the drive shafts had them rebuilt tires balanced. Used to it would only vibrate on the road now it vibrates sitting still. I can look at the engine running and see it shaking just a little and as I increase the engine speed I can feel it in the whole truck sitting still. The vibration was there long before the new clutch so that is not the issue. I have been told maybe a harmonic balancer or motor mounts. However looking at the cost of those items I don't want to just throw parts at it. The injectors are quiet but I guess they could be going out with this many miles. I run the Howes fuel additive on almost every tank of fuel. On occasion when I have neglected to use Howes the injectors would rattle a little. Sounds kinda like lifters tapping. When that happens I just crank up the smarty to 3 for a little while to increase the fuel pressure along with some Howes and that seems to silence them.  I keep up with the maintenance myself as in I do all my own work. The oil and filter is changed every 7-10,000 miles  I don't use the dealer for anything other than warranty or recalls. This is my first diesel so I am new at learning about them. I am a very good mechanic as far as gasoline engines. Not real sure as to where to begin researching the vibration on a diesel. The motor has never been broken into other than front and rear main seals, valve adjustments along with a couple water pumps and one of them was under the 100,000 mile warranty. I am hoping to make a million miles before rebuild (fingers crossed). I understand that stock injectors have a specific number that has to be programed into the computer of the truck for it to run properly and the dealer is the only one with the ability to do that (not positive on that). I have read many post on here about 2 cycle oil and aftermarket injectors. I just want to clear up the vibration. I know if I take it into a dealer for diagnostics they are going to look at the miles and tell me a set of injectors or possible valve job. I know there are good dealerships and bad ones. A few yrs back I kept getting a check engine light so I stopped into a dealer ship while I was on the road and they told me they thought it was the turbo. I could see the tech guy pecking on his computer and ever so often look over his shoulder at my truck. Dead give away he did not have a clue. LOL Anyway I passed on the new turbo. Turns out the map sensor was bad and was throwing the turbo code. As far as the 2 cycle oil what flavor and how much per gallon of fuel? What about the aftermarket injectors? Which ones would you use?  Sorry about rambling on. Any suggestions as to where to start on the engine vibration? Thanks.

12 hours ago, AH64ID said:

Think about it. There is a very very small percentage of people who use additive, and even smaller who use 2-stroke. Based on the doom and gloom on this website everyone who doesn't should have a failed pump, yet thst simply isn't the case. 

 

All I can say is when a name like Bosch makes a test at least is not Doom and Gloom. It real. Even Bosch states that US 520 HFRR fuel is too low in lubricity. Need to be minimum of 450 HFRR or lower. I could understand the statement if it was just a independent shop or delaer stating this but when Bosch does this kind of test and publish the findings... I have to say it best to error on the side of safety.

 

 

Edited March 26, 20169 yr by Mopar1973Man

I've been running two stroke fairly reliably for the past couple years.  However, I do recall  a few years ago, CajFlynn said he never ran the stuff in his trucks.  he just replaced the VP every 150k or so. Makes me wonder if the fuel at 90% of the pumps is significantly better than Bosch's worst case.  

AH, I stick with the Bosch testing that presents itself with evidence. Have you seen any testing on what you are using?

 

Also my 12 valve around 450 K miles on same engine, being that the engine is a bit more basic I think sends a louder message that it responds well to adding the two stroke, more power, better bottom end torque, better mileage. The engine simply comes alive when adding it.

No one is arguing Bosch's information. Minimum HFRR is 520 in the US, not 650. Numbers mean things. 

 

The simple fact of the matter is that fuel isn't that dry. If it was people would be dropping VP44's left and right. 

 

Most VP44 trucks run the stock lift pump and fuel without additives... and they get plenty of miles out of them. 

 

I am also not saying lubricity isn't a bad thing, just saying I don't think 2 stroke is the proper way to increase lubricity. 

 

I need to try and find the test from a few threads ago that shows 2 stoke isn't that great. I don't recall the thread topic but I do recall a bunch of believers discounting it.

6 minutes ago, JAG1 said:

AH, I stick with the Bosch testing that presents itself with evidence. Have you seen any testing on what you are using?

 

 

 

Where is this Bosch testing of 2-stroke as a diesel lubricity improver?

 

Remember.. this is about 2 stroke as a lubricity improver and not about lubricity improving in general. 

 

I do feel that diesel out of the pump is adequate for a long life; however, I do still put an additive it for a little more. I don't really feel it will increase the life that much but I like some of the other benefits as well. 

 

I've seen a test with Amsoil and it did improve it; however, that same test said 2-stroke was a huge improver and the recent 2-stroke test was the opposite. 

 

Lubricity is just one part of the additive I run. I also know that it's an additive designed for diesel fuel. 

 

 

6 minutes ago, JAG1 said:

Also my 12 valve around 450 K miles on same engine, being that the engine is a bit more basic I think sends a louder message that it responds well to adding the two stroke, more power, better bottom end torque, better mileage. The engine simply comes alive when adding it.

 

Have you done a dyno with and without it?

 

I would be curious to see the results. Much like the dyno with and without Cetane booster. 

Edited March 26, 20169 yr by AH64ID

 

Yes there are test results using two stroke in diesel fuel. The test compares several diesel additives with 2 stroke results up near the top in desirability and well within the Bosch specs. OptiLube is at the top for the lowest scoring in the test.

 

I have not dynoed the 12 valve. It responds very noticeably with the 2 cycle and I like saving money for travels as much as possible.

I just filled up.. 60.4% towing miles this calendar year 

On 3/27/2016 at 8:07 PM, JAG1 said:

Yes there are test results using two stroke in diesel fuel. The test compares several diesel additives with 2 stroke results up near the top in desirability and well within the Bosch specs. OptiLube is at the top for the lowest scoring in the test.

 

That's the older test right? It's not a Bosch test like you stated, at least not that I have seen. 

 

The newer test with 2-stroke shows that it might not be what everyone thinks it is. It shows an increase in HFRR on 2/3 of the fuel tested.. makes you wonder what happened to the 3rd, as well as a potential cetane increase (not decrease like Michael has been telling us for years), and it shows severe fouling like I mentioned earlier.  

 

As far as power...

• Engine test results show that a 200:1 blend of 2-stroke oil in diesel results in a 2% loss of engine power in a 16 hour test due to injector fouling, a risk that would apply to any common rail diesel engine, but could also worsen fouling in older engines.

Edited March 29, 20169 yr by AH64ID

1 hour ago, AH64ID said:

I just filled up.. 60.4% towing miles this calendar year 

 

That's the older test right? It's not a Bosch test like you stated, at least not that I have seen. 

 

The newer test with 2-stroke shows that it might not be what everyone thinks it is. It shows an increase in HFRR on 2/3 of the fuel tested.. makes you wonder what happened to the 3rd, as well as a potential cetane increase (not decrease like Michael has been telling us for years), and it shows severe fouling like I mentioned earlier.  

 

As far as power...

• Engine test results show that a 200:1 blend of 2-stroke oil in diesel results in a 2% loss of engine power in a 16 hour test due to injector fouling, a risk that would apply to any common rail diesel engine, but could also worsen fouling in older engines.

I running at 128/1........................for years........................