The problem is, most people who read this will assume its ok to run extended drain intervals, dont know enough to listen to there trucks and will run into problems later.

You do understand that even under light throttle settings that oil is seeing 1700-2200psi for hours on end... with peak pressures in the 2700-3000psi range. Motor oil is not going to stand up to that for more then 3-5k, and should be changed.


Watch the ICP pressures on the bottom screen of that picture... 2800psi peak... Thats with hybrid injectors and a pump dropping pressure (hence the SES light on the dash...)

 

I never heard of pressure being an issue with engine oil longevity. But the things I've never heard of would fill volumes, I'm sure. The pressure on the oil film in bearing clearances would be many more magnitudes greater than that.

Can somebody give me the 10cent quickie version of the Powerstroke oil issue? It was sounding like a sludge problem in the HPOP thingy or something like that, but I'm no Furd guy...

 

its just the HEUI system is hard on oil because its puts it through hell basically

 

I agree with CSIPD on the Pressures and how hard the injection system is on the oil (I disagree with another issue that is dead and dealt with). I never go past 3,000 on an oil change. However; I do agree that synthetic is superior oil (Amsoil, Deep purple, Mobil). I use Delo or Mobil Delvac because thats the best for my buck at this moment. I might not see synthetic unless it's going into my differential.

 

I'm just trying to figure out if the REAL problem the heui is being hard on the oil or the oil is being hard on the heui. Starting to sound like the latter. Here's another question to help the diagnosis:

How much is in the thing we are so painfully disagreeing about?

 

the HEUI is hard on oil, in my opinon, i don't want to start another debate here, if someone wants to run their oil for longer periods of time, go ahead, its just not for me, i'd rather be safe then sorry, so be it if i am wasting money every 3 to 5k, its not your money so dont worry about it ha... i'm sure someone else could elaborate a lot better than i can, i'm not a very good teacher as i have demonstrated here... hope it helped a little

 

The high pressure oil System holds about 3 quarts. It uses the oil to actuate the injection process. A solenoid is activated to hit the high pressure oil. thus injecting fuel into the piston area There is allot more going on I just gave you the nickel version. I am sure somebody can expand on it for you.

 

glad we got someone who can teach here

 

OK, lemme take a stab here, no opinions, suggestions or taking sides one way or the other, just observation and analysis...

The main issue with diesel engine oil is soot. It is small (<1um~), yet abrasive. The filter on your engine is rated for what ~15um at best? Many are in the 20-30 range. Depends on what the manufacturer built it for including clearances everywhere the oil goes, in this case including the heui, right? So it's the oil's job to hold that soot in suspension. That is a big part of the CI specs - soot handling and dispersant properties. So the heui is basically being constantly bathed in dirty oil, starting the day you change it! --Whether or not you change those 3qt. Not changing it only puts you that much further behind in the game to stay ahead of wearing out your heui.

Then later on down the road when the soot agglomerates due to temp/pressure and loading, it starts getting trapped in the filter. When that starts happening, you are due for a change, because overall engine wear spikes at some point.

Anybody see where I'm going with this yet?

 

The oil pressures required to fire the injectors on a HEUI system and the pump that pressurizes it cause the issue. The shearing action of the piston pump and the constant pressures the oil is subjected to break down the anti foam additives and the oil molecules...

What the hell are you asking? The oil breaks down, causing hard starts, lower MPG, lower hp, and more wear due to air in the injection system...

STOP... Please. You have no idea what you are talking about, and each time you spew this nonsense people think you know...

The HPO Reservoir holds about 3qts... which is recycled every time an injector fires. Then that oil drops back down to the pan, is run thru the oil cooler, filter and back to the HPOR... It is NOT a closed loop system, it is NOT a dead head system... PERIOD.

Please... Don't learn from him...

Changing your oil every 3-5k in a powerstroke has nothing to do with how dirty the oil is... The oil is broken down from being run thru the HEUI system. You could filter it down to .5 mic and it would still be broken down. The anti foam aditives are the life blood of a PSD...

On a 5.9, or a 6.7, or a 6.4 or a 6.7 you have one side of an injector to worry about, the fuel side...

on a 7.3 and 6.0 you have two sides, fuel... and oil. The oil side will be damaged by air just the same as the fuel side will be...

Do you run an airdog on your truck or something like that to remove air... or would you like to...

Why? So you dont wear out your injection pump, injectors and nozzles?