Prelude.... This is a COMPLETE Waste of your Time

#1 the oil is supplied from the pick-up at the bottom of the pan

#2 the res does Not drain it self (or it's not supposed to anyway)

#3 the best way is to Stop doing all that and just change the oil

Here's how the system works, and why what you're doing is just fooling yourself that you're being "Extra Good" to your engine. The moment the engine starts the LPOP (what's supplying the engine with oil) pumps oil into the HPOP reservoir at a rate Many times higher than the HPOP is using it. Maybe 10% of that oil is going to the injectors and 90% is overfilling the res and, thru a standpipe 1" down from the lid, flowing right back into the pan. That 10% going to the injectors (at idle) is being ejected out of each injector and Also going back into the pan. Every ounce of oil in your engine is the Same oil, it's All been thru the injectors countless times, it's All been in the reservoir and overflowing it constantly as it runs.

There is simply No Way of Ever draining your engine of oil when doing a change (the reason you see it darken is because there's still a quart or two that didn't drain). There's oil in the Valley, the Heads, the Oil Cooler (lots there actually), and the HPOP. You're making an insignificant difference during a change when draining and refilling it (you could actually refill the entire 15qts thru that little hole in the lid, just keep pouring-it-in, it'll go down the standpipe and into the pan)..,


btw Bill Hewitt is a complete idiot, you should find better sources of information

 

een

Nasty??? Really, you took me telling you that you were wasting your time as being Nasty?

DuDe, suck-it-up, if I were being nasty...... ~ hehe

I actually thought I was being good to you! I took the time to give you a through explanation of how the system worked, pointed out how just the little bit you're changing wouldn't make up for all the other places you're not changing. That kind of stuff...

Bill Hewitt is the Originator of the myth. It is He that suggests that the HiPres Oil system is some kind of "closed loop" and I assumed you go that misinformation from him. My Bad

OK , I have no problem sucking it up. I do thank you for talking the time to answer and give me your explanation of how the system works. . The reason I thought you were being nasty is that since I asked a question like this you assumed I did not know that the LPOP was supplying oil to the engine , this I took as insulting . Then you made an assumption based on Mr. Hewitt in your opinion starting this " myth " as you call it .... a further insult for which I accept your apology .....( my bad).
. Furthermore getting a extra quart of old oil out of your engine during an oil change may be insignificant as you say to you , but honestly any one who can think can understand that removing as much of the old oil as possible is not a negative thing, and therefore not a waste of time. Now I don't profess to know as much about the 7.3 as you do , but I am learning and so there it is . I will be gracious and forgive you what I perceived as insults and therefore nasty . I am not thin skinned , but neither am I afraid to stand my ground . Therefore Sir , I give you the last word .

 

Ok man , you don't have to be so nasty about it. ... I have no idea who Bill Hewitt is .

 

Nasty??? Really, you took me telling you that you were wasting your time as being Nasty?

DuDe, suck-it-up, if I were being nasty...... ~ hehe

I actually thought I was being good to you! I took the time to give you a through explanation of how the system worked, pointed out how just the little bit you're changing wouldn't make up for all the other places you're not changing. That kind of stuff...

Bill Hewitt is the Originator of the myth. It is He that suggests that the HiPres Oil system is some kind of "closed loop" and I assumed you go that misinformation from him. My Bad

 

the only way to get all the oil out of an engine is take it apart and wash all the parts in a parts washer. No matter what you do there is still oil in the lifters, oil pump, oil passages in the block , etc.

 

just drain and fill both my 7.3s each with over 300k baldwin filters and rotella dino not synthetic had one hpop go at 260k and 20 years old pretty reasonable i’d say.

 

There is ONE scenario where one may wish to change the HPOP oil: This would be if you are changing oil types or viscosity, are conducting UOA, and want the most accurate readings possible on the next UOA following the change. Because of the significant amount of oil left in the engine, the next UOA after the change of type or viscosity may show results of the residual oil. I had this happen. My truck came to me with 10/30W in the sump. I ran it for a period of time, changed it to the 15W/40 that I prefer for my location, and sent in a sample. On the next sample of the now 15W/40, the viscosity readings were low for a 15/40. The following sample (now the 3rd) the viscosity readings were as-expected for 15/40. It was no big deal, I understood thatt the low readings were a result of residual 10/30 left in the engine, and waited for the follow-up sample at the next change. Technically, the interval where I first ran 15/40, the viscosity of the oil in the sump didn't meet the specs for a 15.40 because of the residual 10/30. Had I removed the HPOP oil, the interval after the change to 15/40 probably would have been in spec. The engine didn't care. Either did I.

 

Thank you for this information . I quote you, "Because of the significant amount of oil left in the engine," This has been my point , that the oil left in the HPOP Reservoir is not insignificant . Along with the residual oil left in the rails, oil cooler and etc it becomes significant , especially in the case you have pointed out . Thank you for this valuable input.

 

The amount of residual oil left behind may be "significant" in proportion to the amount that came out, but if the oil that came out was still serviceable in that it wasn't contaminated beyond usable limits, that there is any residual oil of any quantity left behind is insignificant as far as whether it remains in the engine or not.

Not worth the effort to attempt to "get it all" during a routine oil change. You gain nothing except taking the risk that you cause problems where none existed before. Like a leak at the HPOP plugs, or introducing contamination directly into the pump cavity by dirt falling in by removing the plug and the dirt ends up in an injector, causing a misfire.

Don't try to fix something that isn't broken

 

The amount of residual oil left behind may be "significant" in proportion to the amount that came out, but if the oil that came out was still serviceable in that it wasn't contaminated beyond usable limits, that there is any residual oil of any quantity left behind is insignificant as far as whether it remains in the engine or not.

Not worth the effort to attempt to "get it all" during a routine oil change. You gain nothing except taking the risk that you cause problems where none existed before. Like a leak at the HPOP plugs, or introducing contamination directly into the pump cavity by dirt falling in by removing the plug and the dirt ends up in an injector, causing a misfire.

Don't try to fix something that isn't broken

Noted , If I do this again, and now that I am really educated about this, I will be extra careful not to let dirt in ...I have been reasonably careful. I expect that I will not be doing this again , so thank you again to all who had input . I love this forum , it has saved me $ , taught me and I am still learning .

 

I've always compared it to Masturbation, it's all about making you feel good but without doing any harm

Could be though, that there actually might be potential for harm if you introduce, thru the funnel or just by opening the res, unfiltered/contaminated oil into it. Never considered that...

If removing 8oz. of "old" oil (while having to leave another 20oz or more, left in the cooler/heads/valley/pan) makes you have a Happy Ending, then rock-on but, I would also pay particular attention to overall cleanliness...

 

Complete waste of time to change the oil in the HPOP res, its not a closed system, once oil leaves the reservoir to fire an injector it cannot get back into the reservoir without draining down into the oil pan then going back up though the pickup tube, oil filter. LPOP, ect. The system is constantly circulating, and If you are worried about leaving dirty oil in the system when doing an oil change you would be better off by reducing your mileage between oil changes. This topic has been brought up for 13 years now and the answer hasn't changed.

 

If you are worried about leaving dirty oil in the system when doing an oil change you would be better off by reducing your mileage between oil changes.

I've never thought of this, but you are 100% correct-o-mundo. Gave ya a like for it.

Interesting trivia: Big 2-stroke ship engines (100,000HP @ 102 RPM stuff) never change the lubricating oil for the life of the ship. 30 years. The clean it with centrifuges, and filter it, but never change it.
The EMD series of locomotives from the 50s through the 90s didn't change oil between major overhauls. The EMD engines have a zillion places for the cooling system to leak into the crankcase. Just a matter of when, not if, that cooling water will end up in the sump. Coolant makes a mess and damages bearings and stuff. Water does not. So EMDs used water for their cooling systems. But water freezes, and locomotives are parked in freezing conditions. EMDs have water-drains for the engines that either manually or automatically drain the engine right onto the track if temperature becomes low enough that freezing becomes a threat. There is an indication in the cab (or a big sheet of ice on the ground) If the system drained; the crew fills it back up from a service truck and away they go. The water in the oil vaporizes during normal engine operation and is carried away by the crankcase ventilation system.

Some operators don't change their oil at all, much less concern themselves with minor contamination or dilution. Think about the issue objectively.