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How long can I go on dirty used oil? #4096893 05/14/16 06:48 PM
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Run Offline OP
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I am trying something so cringe worthy most may want to look away from this thread. I am using nothing but dirty old oil in a truck engine. I'm curious as to how long I can keep this thing going. The engine itself is a 4.9L Inline 6 ford and its toast beyond repair. Time to have some fun. Anyone else using up their spent oil in this fashion? Any failures to report?


09 Hyundai Tucson 2.0 5spd
Re: How long can I go on dirty used oil? [Re: Run] #4096901 05/14/16 06:53 PM
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gfh77665 Offline
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Been there done that! If you change the filter in reasonable intervals (5K miles or so) the thing will run indefinitely!

EDIT: 8000 Km. for our Canadian friends!

Re: How long can I go on dirty used oil? [Re: Run] #4096904 05/14/16 06:54 PM
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AuthorEditor Offline
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I don't like the idea, but I bet you'll get bored with the experiment before you destroy it. I suspect there are a lot of cars driving around that have never had their oil changed. I was on another car forum once where someone said they never did any maintenance on leased cars--just drove them two years and turned them in.

Re: How long can I go on dirty used oil? [Re: Run] #4096907 05/14/16 06:57 PM
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gfh77665 Offline
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Yes, there was a viral pic/story of some idiot that drove his new Mercedes 60,000 miles to failure doing this.

Re: How long can I go on dirty used oil? [Re: gfh77665] #4096920 05/14/16 07:09 PM
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Originally Posted By: gfh77665
Yes, there was a viral pic/story of some idiot that drove his new Mercedes 60,000 miles to failure doing this.


There are couple. I've seen an Audi one with about the same mileage.

I've also seen a BMW tech post about a car going 50k without a change. It was still running apparently.

There is also the BITOG thread about the Lincoln LS that went 26k without a change.

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=224649


BITOG or: How I Learned to Stop Worrying and Love the Extended OCI
Re: How long can I go on dirty used oil? [Re: Run] #4096927 05/14/16 07:17 PM
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Farmer Offline
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Originally Posted By: Run
I am trying something so cringe worthy most may want to look away from this thread. I am using nothing but dirty old oil in a truck engine. I'm curious as to how long I can keep this thing going. The engine itself is a 4.9L Inline 6 ford and its toast beyond repair. Time to have some fun. Anyone else using up their spent oil in this fashion? Any failures to report?


Are you talking about the oil I gave you? :p

Re: How long can I go on dirty used oil? [Re: Farmer] #4096933 05/14/16 07:27 PM
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I'm almost out of your oil so I did an oil change on another truck just to keep supply on hand.


09 Hyundai Tucson 2.0 5spd
Re: How long can I go on dirty used oil? [Re: Run] #4096938 05/14/16 07:35 PM
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So what was the UOA on the oil you drained? If it was still in spec, why wouldn't the old Ford run another year or two on it... laugh

There is a LOT of 1/2 used oil out there...

Last edited by BrocLuno; 05/14/16 07:36 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: How long can I go on dirty used oil? [Re: BrocLuno] #4096950 05/14/16 07:50 PM
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gfh77665 Offline
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Originally Posted By: BrocLuno

There is a LOT of 1/2 used oil out there...


Yep. I use Mobil 2 whenever the opportunity arises. I have even used PYB-2 and SuperTech-2 in old beaters for the second half of the 10K filter change interval. Believe it or not, zero issues.

BTW the PYB-2 comes out of my Honda Odyssey with the OLM at 40 or 50%, so it not really "done" at that point.

Re: How long can I go on dirty used oil? [Re: Run] #4096954 05/14/16 07:58 PM
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walterjay Offline
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On numerous occasions I have take my 5K synthetic used oil and put it in my daughters 99 Honda Accord. Car still runs great today although it does use a little oil.

Re: How long can I go on dirty used oil? [Re: Run] #4096957 05/14/16 07:59 PM
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Farmer Offline
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Originally Posted By: Run
I'm almost out of your oil so I did an oil change on another truck just to keep supply on hand.


I have some Castrol Edge Black 5W-30 coming out tomorrow, want that?

Re: How long can I go on dirty used oil? [Re: Run] #4096964 05/14/16 08:05 PM
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I've been running used oil in my accord for about 35000 miles. Burns so much that it's always fresh.


Cadillac CTS-V 6.2L 10w30PP
Volvo P1800 Euro L
76 Mercedes 300D Rotella T4
Series III Land Rover VWB
02 Yukon 10w30 PP
01 P71 M1 EP-HM 0W20
95 Accord - 386k. Mobil 2 RIP
Re: How long can I go on dirty used oil? [Re: Run] #4096968 05/14/16 08:11 PM
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I knew a WHEELED VEHICLE MECHANIC in the Army whos 2008 (bought 2014) 300 5.7L blew up in January due to him never changing the oil.
said "he didn't know it needed oil changed"

Said he bought it used with 85K on it and it is now totaled at 110K

25K on OCI, Chrysler/Dodge Dealership here that he bought it from uses Pennzoil Gold and LuberFiner E-cores on their USED cars.

I always dump my used oil into the lawnmowers, run it for a season, changing every Spring, Summer, and Fall. Ill store it with NEW oil in the winter.

The collection of Spring/Summer/Fall used car turned used mower oil is then placed in an surplus military outdoor diesel burn space heater that cost 5$ at auction to burn off and heat up the back patio area. I mix it 50% Used oil, 50% diesel inside a surplus military fuel can, and the lines supply it to the heater.. Burns longer than straight diesel.

Any left over from the previous season gets re-stored and gets the next years car waste oil added to it, and repeat.


Anyone have a back patio/porch, look for one of these, they can be found pretty cheap, as can surplus fuel cans.



I am not a hippie, but hey, it works.
Never had a car/mower/heater issue,
might as well get that little bit of warmth and the full money I spent out of the stuff. I hear walmarts are starting to convert to burn stored TLE from the year in their store heating system. How much that is true, I don't know.



Last edited by GumbyJarvis; 05/14/16 08:18 PM.

2018 RAM 1500 SLT 5.7L HEMI 19K
Schaeffers 5w20 - Mahle OC 614

Disabled US Army Vet
OEF 2013-2014
Re: How long can I go on dirty used oil? [Re: Run] #4096975 05/14/16 08:20 PM
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GumbyJarvis Online Happy
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Previous mentioned heater can be had here:
http://www.sportsmansguide.com/product/index/us-military-dual-fuel-stove-amp-heater?a=1545208

or at a surplus store/military auction.

There is no emotion in the thing, it gets warm, and is pure metal, it gets hot


2018 RAM 1500 SLT 5.7L HEMI 19K
Schaeffers 5w20 - Mahle OC 614

Disabled US Army Vet
OEF 2013-2014
Re: How long can I go on dirty used oil? [Re: Run] #4096977 05/14/16 08:21 PM
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That Ford engine is one of the toughest to kill anyway, as long as there is oil of some type in there.


2018 VW Passat GT VR6 - 14k - Castrol Pro OE 5w40 - VW OEM filter
2012 KIA Sedona 101k - Valvoline Maxlife 5w30
2009 Ford Focus 138k - Valvoline 5w30
2004 Jeep Grand Cherokee, gone but not forgotten.
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