Stop changing oil in oil burning engine?

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Originally Posted By: d00df00d
you'd always have a fraction of oil in there that was many thousands of miles old.


EVERY SINGLE engine in the world has this!
You never get all the old oil out....

AND IT DOESN'T MATTER ANYWAY! The old blends with the new and life goes on...

If you think it'll really make a difference, just go ahead and keep believing that. But really ..... it doesn't make a difference.

DATA and PROOF exist that shows regularly adding new oil COMPLETELY negates any effects of the old oil.

Once you burn 1qt/every 1000 - - you never ever ever ever ever have to change your oil ever again.
 
I had an 1986 Dodge Caravan with the oil burning Mitsubishi engine. It started burning oil at 150,000km due to bad valve seals and rings which these engines were known for. We stopped changing the oil and changed only the filter and drove it like this to 460,000km no issues. In between we changed the cylinder head a couple times due to it cracking (also a common problem). This slowed down the oil consumption but never stopped it so we continued never changing the oil and just changing the filter.
 
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Originally Posted By: Linctex
Originally Posted By: d00df00d
you'd always have a fraction of oil in there that was many thousands of miles old.


EVERY SINGLE engine in the world has this!
You never get all the old oil out....

And that fraction is bigger if you never drain the sump. That's the point.


Originally Posted By: Linctex
DATA and PROOF exist that shows regularly adding new oil COMPLETELY negates any effects of the old oil.

Once you burn 1qt/every 1000 - - you never ever ever ever ever have to change your oil ever again.

Really? Interesting.

Care to share any of it?
 
I used to have a 1992 Ford Escort with the 1.6 Carbed CVH engine that burned a lot of oil, i just kept adding cheap parts store brand 10w-40 and it ran just fine, but it burned tons of oil.
I remember i did the last oil change on it in June 2012, and i did not change the oil ever after that, i just kept driving it until the radiator blew and it really wasn't worth fixing so i sent it to the scrapyard In April 2014. it had some 280.000 Kms i think, and in that time period i put about 10/15.000 Kms on it.
 
Originally Posted By: Linctex
1 quart every 25-50 miles. I owned one that bad once.


Thanks! I have always wondered about that.
 
Originally Posted By: d00df00d
Originally Posted By: Linctex
DATA and PROOF exist that shows regularly adding new oil COMPLETELY negates any effects of the old oil.

Once you burn 1qt/every 1000 - - you never ever ever ever ever have to change your oil ever again.

Really? Interesting.

Care to share any of it?


Here it is: 15k miles OCI with 15 qts of makeup oil
 
If regularly adding oil "COMPLETELY negate[d] any effect of the old oil," I'd expect TBN to be a whole heck of a lot higher than 2.8. The current PDS for that oil indicates a starting TBN of 8.4. So, even if a single $28 UOA could be "proof" of anything, this one wouldn't be proof of Linctex's point as he stated it.

I'm sure he had something else in mind. Let's see if he comes back and posts what he was thinking of.
 
Originally Posted By: d00df00d
If regularly adding oil "COMPLETELY negate[d] any effect of the old oil," I'd expect TBN to be a whole heck of a lot higher than 2.8. The current PDS for that oil indicates a starting TBN of 8.4. So, even if a single $28 UOA could be "proof" of anything, this one wouldn't be proof of Linctex's point as he stated it.

I'm sure he had something else in mind. Let's see if he comes back and posts what he was thinking of.


You are right, that UOA shows a considerable amount of TBN depletion, and oil isn't like when it was in the bottle before being using. So oil must be changed even in an oil burner.

But what I really care is that I can do 3k filter change intervals and drain the oil and put another new filter every 6k miles without problems.

The only thing that makes my doubt of this plan is the 600 ppm of sulphur fuel that I use on my car (which is the only one avaible). Should I worry? Can I do 6k OCI safely?
 
My truck uses a qt every 1500 miles. I drive ~6,000-7,000 miles a year.

I have tried to make myself not change the oil and just add oil and change the filter, but it just does not feel right.
My previous interval, my makeup oil was "used" oil from my wife's car (Pennzoil Platinum with 5,000 easy miles on it).

I currently have almost 4000 miles on this interval.
1 qt new oil added at 1,500 miles in, 1.5 qts at 3000 miles (I changed the filter then (5 months)).
I am trying to make myself wait till 6000 miles to drain and change the filter, but not sure if my brain will let me.

I am sure I could probably do 9000 mile intervals pretty easily, but agree with those above that mention other stuff being left behind when the oil drops. Best to drain it occasionally IMO.

I did work with a guy that had a mid 90's Chevy truck that used a qt every 600 miles or so. He said he just changed the filter every 5000 miles or so and just continually topped the oil off, added a qt of oil every 3rd fill-up. He had been doing it for 5-6 years when I met him and had the truck for 3 more years before he left the place, no idea how long he did it for after that.
 
Originally Posted By: Emanuel
The only thing that makes my doubt of this plan is the 600 ppm of sulphur fuel that I use on my car (which is the only one avaible). Should I worry? Can I do 6k OCI safely?

Sulfur is a problem for sure.

If I had to guess, I'd say 6k drain intervals are probably fine. But there's no way to know without oil analysis.

What oil are you using?
 
Originally Posted By: eljefino
There's junk in the bottom of the sump that'd be nice to drain annually.


You don't think the filter would catch most junk?

Originally Posted By: Emanuel
You are right, that UOA shows a considerable amount of TBN depletion, and oil isn't like when it was in the bottle before being using. So oil must be changed even in an oil burner.


2.8 after 15k is not bad IMO. You're constantly adding oil so the TBN will never completely deplete.

Originally Posted By: Emanuel
I love this car, I really don't want to neglect it. But my plan is to do 3k filter change intervals and 6k miles oil changes.


What does that accomplish though? Your car will still burn oil regardless of how often you change it.

You can baby the car and change it every 6k after you get the motor rebuilt or replaced.

Originally Posted By: dishdude
If it's a piece of junk, definitely. Otherwise, go to extended OCIs like 10k +.


That's what I would do as well.
 
Originally Posted By: camrydriver111
2.8 after 15k is not bad IMO. You're constantly adding oil so the TBN will never completely deplete.

1. If you mean it's impressive for that long an OCI, I agree. Either way, it's not the same as "COMPLETELY negates any effect of the old oil."

2. Low TBN is problematic long before it reaches zero. 2.8 is really low.
 
In the 80's I had several oil burners that I had to put many miles on. One used quart every 250 miles and never changed just replaced engine then a Chevrolet small block in pickup that used 1 quart every 1000 which Chevrolet stated normal. I change oil every 3k or monthly since I needed truck to last as in the 80's to 90's I was putting 70 thousand a year on a vehicle. I sold the Chevrolet to parents for there business after I got 200k then they got another 150k for a total of 350k out of a so called oil burner. Point being change oil and top off at recommended or early oil changes and should last a long time. Most manufacturers state 1 quart per 1000 miles is normal.
 
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