[drmiller100]

I run Delo 15/40 oil, and typically change at 5,000 miles.

At about 4300 miles, performance drops off, smoke goes up, the truck becomes somewhat sluggish. As SOON as I change the oil, new truck. My theory is that old oil gets diluted and thinner, leading to lower HPOP pressures, and less go.

So, if we ran thicker engine oil, could get higher, more sustainable HPOP pressures?????

 

[Kanman]

How about sticking your pressure gauge on a head port just after you do an oil change. Reinstall that pressure near the end of the oil change cycle and compare the two.

I would think it has something to do with the oil filter starting to let crud into the injectors myself. Sounds like its worth looking into.

How much would a few gallons of 90 weight cost anyways?

 

[TheHammer69]

[ QUOTE ]
How about sticking your pressure gauge on a head port just after you do an oil change. Reinstall that pressure near the end of the oil change cycle and compare the two.

I would think it has something to do with the oil filter starting to let crud into the injectors myself. Sounds like its worth looking into.

How much would a few gallons of 90 weight cost anyways?

[/ QUOTE ]

It has nothing to do with your oil filter crud theory. An oil filter becomes more efficient over time until it plugs up and it's not plugged up at 4000 miles. It definately has to do with the shear down of the oil and the single HPOP not able to maintain ICP as well with thinner oil.

I don't suggest adding gear oil to any engine, the additive chemistry of gear oil can be corrosive to certain engine components, specifically anything brass/bronze.

Hammer

 

[DENNY]

You may be having a foaming issue. This would get worse with increased miles on the oil.
DENNY

 

[TimC63]

[ QUOTE ]
You may be having a foaming issue. This would get worse with increased miles on the oil.
DENNY

[/ QUOTE ]

That was EXACTLY my thought. I have experienced that on long vacation trip while hauling the trailer, power can really fall off. I now carry a few bottles of the Fleetrite Oil Defoamer and will dump a bottle in if I experience this on trip. The one time I resorted to this it brought the performance back up to say, 90% of what it should. Got home and changed the oil and performance was back to normal...

I haven't used DELO since it was CH-4 rated. I would think that DELO, Rotella, and the other majors are all CI-4plus, they should all be good with these injectors.

I have heard that some people add a bottle of this with each oil change. Seems unnecessary with good oil. Also note that the instructions on the defoamer warns against using more than one bottle per oil change.

FWIW!

God Bless,

TC

 

[Kanman]

[ QUOTE ]
[ QUOTE ]
How about sticking your pressure gauge on a head port just after you do an oil change. Reinstall that pressure near the end of the oil change cycle and compare the two.

I would think it has something to do with the oil filter starting to let crud into the injectors myself. Sounds like its worth looking into.

How much would a few gallons of 90 weight cost anyways?

[/ QUOTE ]

It has nothing to do with your oil filter crud theory. An oil filter becomes more efficient over time until it plugs up and it's not plugged up at 4000 miles. It definately has to do with the shear down of the oil and the single HPOP not able to maintain ICP as well with thinner oil.

I don't suggest adding gear oil to any engine, the additive chemistry of gear oil can be corrosive to certain engine components, specifically anything brass/bronze.

Hammer

[/ QUOTE ]

So according to you oil becomes more clean as it lives its life in our trucks with the stock filtration system. We can just throw away all the bypass filters and all that other high dollar high tech jibber jabber installed on our trucks cause its just not needed. Correct me if I misunderstand. You are saying that fresh oil dumped into our engine will not pass through the HPOP and injectors as smoothly and efficiently as oil with 4000 miles on it? Who said it was plugged at 4000 miles, wasn't me, try again? BTW I believe that is actually a 100% untrue statement. There is no known duty cycle at which a filters life becomes depleted. This would depend entirely upon the conditions at which the engine is being operated in.

I do have to agree that adding 90 weight oil to our engines is a bad idea. 99.9% of the folks that read my comment will take it as a joke. For those such as yourself that didn't get it IT WAS A JOKE.

 

[ryaneverk2]

Hammer was just saying that an oil filter becomes more efficient over time and that it's not plugged yet at 4,000 miles, simply to demonstrate that it's not due to the oil filter starting to let crud through, as you first suggested.

In other words, you had suggested that with more mileage on the oil, as in leading up to a change, the oil filter starts letting crud through. Hammer pointed out that, actually, the filter filters better the longer it's used (up to a point... diminishing returns? /ubbthreads/images/graemlins/grin.gif), and so the sluggish performance noted until the oil is changed is not due to the oil filter letting crud through.

He's also not saying that the oil becomes more clean the longer it's in. Only that the filter is still working just as well if not better at around 4k miles as when the oil and filter were fresh.

Whew! /ubbthreads/images/graemlins/warmsmile.gif

 

[TheHammer69]

Kanman....Ryaneverk2 just did a good explanation as to what I was trying to get across to you. Somehow, you managed to misconstrue what I said.

What i am saying about thinner oil is that it has a tendency to "bleed off" faster through the HPO system than thicker oil. When the oil thins, the IPR duty cyle will have to increase slightly to maintain the same ICP. But let's say you have a weak pump with excessive leakage, and the poppet inside the inejectors has excessive leakage, and the IPR duty cycle is maxed out....thinner oil will have a lower ICP compared to thicker oil. There also is the slight aeration of oil over time that could lead to the issue also, which has already been mentioned.

HAmmer

 

[Suns_PSD]

I noticed BIG differences in the way my 7.3 ran when I ran dino oil as at around 3K it would get rough. The oil just gets sheared and the injectors don't work as well.

Then I switched to synthetic and then there was absolutely no difference even running the oil out to 10K miles.

I use to always look forward to changing my dino oil because it always ran better but w/ the sythetic there is absolutely no difference when you drain the old syn and put in the fresh stuff.

 

[Kanman]

I misspoke/typed. What I should have said was the oil gets more dirty as time goes on period. I was incorrect when I said the filter lets less oil through.

The HPOP gets its oil unfiltered, correct? Straight from the pump so the oil filter would be irrelevant anyway.

 

[444-4D]

[ QUOTE ]
The HPOP gets its oil unfiltered, correct?

[/ QUOTE ]

Only when starting.

 

[drmiller100]

[ QUOTE ]
I misspoke/typed. What I should have said was the oil gets more dirty as time goes on period.

[/ QUOTE ]

actually, this your above statement is incorrect as well. "Dirt" in the oil is more a factor of air filter efficiency, environment, and to some extent miles driven.

Change your oil, let the truck sit for extended periods of time without starting it, and the oil will NOT become more "dirty."

In any case, we don't want to run hypoid oil.
will straight 50 weight give more horsepower then 10-40????

 

[Mach1]

Lets talk fuel oil dilution, which sounds like what is happening to your truck. Do you let your truck idle for long periods of time, even in stop and go, or CITY driving?

Something, is happening to your oil, a OA is in need. Either you have a shearing problem, or a fuel oil dilution problem, although a foaming issue could be doing it as well. You are losing your additives in your oil, quite possibly.

As the others have stated the Schaeffers syn stays fresh for a constant 10k Miles. and Blackstone has even stated to go to a 12K interval on the 9000.

 

[Kanman]

[ QUOTE ]
[ QUOTE ]
I misspoke/typed. What I should have said was the oil gets more dirty as time goes on period.

[/ QUOTE ]

actually, this your above statement is incorrect as well. "Dirt" in the oil is more a factor of air filter efficiency, environment, and to some extent miles driven.

Change your oil, let the truck sit for extended periods of time without starting it, and the oil will NOT become more "dirty."

In any case, we don't want to run hypoid oil.
will straight 50 weight give more horsepower then 10-40????

[/ QUOTE ]



Not an incorrect statement in any way shape or form. Dirt and crud enters from "where ever" it is irrelevant. 10 different places it could possibly enter. Where it ends up is in the oil period. Oil does not get cleaner between oil changes, that is the point...

I would however say that your statement is incorrect. Oil most certainly will break down and separate from its additives. Condensation will collect in the oil. Would you call that clean oil? Ever rebuilt a junk yard engine thats sat for a couple of years? Not many things smell worse than the sludge that comes from one of those motors.

50 weight will never give more HP than 10-40. Heavier oil equals more drag on mechanical components.

 

[drmiller100]

twin hpop's have more drag then a single hpop.

yet, the twins make more power then the single.

 

[DART505]

I just switched to Rotella 5W40 full synthetic yesterday (usually run 10W40 Rotella non syn normally)& I notised I had the truck idling for about 4 to 5 minutes & It looked to be smoking more than normal?I usually change my oil at 500 miles (not a miss type)it always looks like it has 10,000 miles on it with the toilet flushers I have.I am running 3800 psi oil pressure tune (close to popoff on the pumps)& will put more time on it to see if it helps. /ubbthreads/images/graemlins/shrug.gif /ubbthreads/images/graemlins/biggrin.gif

 

[stackedpsd99]

lol @ people on Kanman's case...

 

[Mach1]

The advantage of the twins holding OP over the single negates the additional friction loses by the second pump..Compare apples to apples. The Syn oil thinner viscosity and SUPERIOR additives will hold and generate higher pressures, while minimizing shearing, parasitic loses, and maintaining higher HPOP Oil pressure. Keep reading, there is some good info here being exchanged.