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#1690845 - 12/01/09 12:21 PM 2T oil in Diesel to improve lubricity
drop Offline


Registered: 07/21/03
Posts: 13
Loc: Mexico
I`ve been reading about 2 time engine oil in diesel (1:200) to improve lubricity on new ULSD, has any one known about this practice?

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#1690901 - 12/01/09 01:04 PM Re: 2T oil in Diesel to improve lubricity [Re: drop]
Cup of Joe Offline


Registered: 01/16/06
Posts: 1821
Loc: United We Stand
http://www.johnfjensen.com/Diesel_fuel_additive_test.pdf

Used oil at 200:1 should no improvement.
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#1690915 - 12/01/09 01:23 PM Re: 2T oil in Diesel to improve lubricity [Re: Cup of Joe]
McKittrick Offline


Registered: 06/01/05
Posts: 191
Loc: Central Texas USA
In Mexico two stroke oil is called dos tiempo 2T

Two stroke oil (wal mart TC-W3) tested in the pdf linked above as having a fairly good reduction in wear scarring of 162 micron reduction at a cheap cost of $1.09 per tank. With the caveat that it is not recommended for 2007 or newer.

I use a mixture of two stroke oil, and stanadyne (which did not show wonderful wear properties in this test).


Edited by McKittrick (12/01/09 01:24 PM)

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#1690966 - 12/01/09 01:55 PM Re: 2T oil in Diesel to improve lubricity [Re: McKittrick]
Cup of Joe Offline


Registered: 01/16/06
Posts: 1821
Loc: United We Stand
Well paint me red and call me Charlie.

I use TCW-3 in my tractor even though its off road diesel.
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#1690973 - 12/01/09 02:02 PM Re: 2T oil in Diesel to improve lubricity [Re: Cup of Joe]
McKittrick Offline


Registered: 06/01/05
Posts: 191
Loc: Central Texas USA
I have been using the TC-W3 in the diesels for a while, and now I pour about 3 ounces in each tank of the gasoline engined cars too.

My dad used to buy top end lube when I was a kid, so I guess I am using the 2 stroke oil for that purpose on the gasoline engines(so far I haven't seen the mpg magic the Tc-W3 posts were showing and I have not tried running MMO instead) and to help lubricity on the diesel.

Thanks for the link on that test of lubricity.


Edited by McKittrick (12/01/09 02:09 PM)

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#1691348 - 12/01/09 06:41 PM Re: 2T oil in Diesel to improve lubricity [Re: McKittrick]
drop Offline


Registered: 07/21/03
Posts: 13
Loc: Mexico
Good to read here are users of this metod, I`ve been using it for the first time in my last refill, I heard and feel it smoother, I`ll do the 500ml next time, I used 350mm about, for 75 liters of fuel. Found another post talking abut it in diesel fuel forum, very crowded!
It is nothing old, old truck drivers use something similar, they use engine oil on every refill of diesel, for the pump and injectors to lub better, but is the firs time I read about 2Cycle oil, That is how it is name in english.
I`ll high the dose!

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#1691352 - 12/01/09 06:44 PM Re: 2T oil in Diesel to improve lubricity [Re: drop]
drop Offline


Registered: 07/21/03
Posts: 13
Loc: Mexico

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#1692068 - 12/02/09 06:10 AM Re: 2T oil in Diesel to improve lubricity [Re: drop]
Cup of Joe Offline


Registered: 01/16/06
Posts: 1821
Loc: United We Stand
This has been discussed widely mostly for gas engines, but diesels as well. I am using it in my tractor because some units left the factory with a composite plastic gear in the injection pump that fails around the 300-400 hr mark. There are not allot of units that have had this particular failure. But its always better safe then sorry so I am using it even in offroad non-ULSD diesel. If I have to buy Diesel at the local retailers it is all ULSD so I would rather have 2C oil in the tank already.
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#1698522 - 12/07/09 02:56 AM Re: 2T oil in Diesel to improve lubricity [Re: Cup of Joe]
azsynthetic Offline


Registered: 06/01/07
Posts: 1237
Loc: Phoenix AZ
I am running 8oz of synthetic 2T oil per fill up in my Golf 1.9L TDI for the past 75K miles. I got better mileage (~ 2mpg) and no problem that I can see or detect.

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#1804711 - 03/05/10 10:09 AM Re: 2T oil in Diesel to improve lubricity [Re: azsynthetic]
Oldwolf Offline


Registered: 09/22/05
Posts: 995
Loc: Cary, NC
I run a 200:1 ratio of TCW3 in my MB.
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#1807564 - 03/07/10 04:55 PM Re: 2T oil in Diesel to improve lubricity [Re: Oldwolf]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
I use 2t oil in my wifes 2002 Powerstroke diesel as recommended by the injector shop people.
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#1835100 - 03/28/10 02:53 PM Re: 2T oil in Diesel to improve lubricity [Re: Steve S]
JHZR2 Offline



Registered: 12/14/02
Posts: 40520
Loc: New Jersey
I use this amongst other things in my diesels and gassers. The wal mart tcw3 oil stinks like kerosine partially burning, so I've found it unsuitable for my use, where oil is kept in the trunk for treatment. I run pennzoil and amsoil, as they don't stink and offgas as much.

I do like to change adds often to get various cleaning properties of each, but a watersport tcw-3 oil is a good choice. Is 200:1 the best option? Maybe, maybe not...

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#1868892 - 04/23/10 10:30 PM Re: 2T oil in Diesel to improve lubricity [Re: Cup of Joe]
Pablo Offline


Registered: 10/28/02
Posts: 47175
Loc: Duvall WA - Pacific NW USA
Originally Posted By: TaterandNoodles
http://www.johnfjensen.com/Diesel_fuel_additive_test.pdf

Used oil at 200:1 should no improvement.


Actually there was decent improvement and good value for the buck. I'm thinking try a different 2T oil and lower the ratio a tad, use it with some biodiesel....wholly shebang!

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#1886456 - 05/10/10 04:27 PM Re: 2T oil in Diesel to improve lubricity [Re: Cup of Joe]
DesertDually Offline


Registered: 06/17/08
Posts: 59
Loc: Arizona, USA
Originally Posted By: TaterandNoodles
http://www.johnfjensen.com/Diesel_fuel_additive_test.pdf

Used oil at 200:1 should no improvement.


I question this test because they used the old oil at such an incredibly low ratio. Most folks I know, run 2 gallons of it per 30 gallon tank, not a measely 16 ounces!!! At even 1 gallon per tank, it would save you 4 .50 in cost of the Stanadyne (which was directly above the used oil in the test results) while providing the same (if not higher) lubricity boost. Also saving you the cost of the gallon of diesel fuel it displaces in the fuel tank. Engine runs just fine on this. The GM 6.5 turbodiesel is the only diesel engine I know of that you CANNOT run used oil in. This engine comes with an optical sensor in the fuel pump, there may be other engines that use these, I dont know.
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#1898823 - 05/21/10 03:10 PM Re: 2T oil in Diesel to improve lubricity [Re: DesertDually]
bullwinkle Offline


Registered: 10/09/04
Posts: 6879
Loc: Cincinnati, OH, USA
Originally Posted By: DesertDually
Originally Posted By: TaterandNoodles
http://www.johnfjensen.com/Diesel_fuel_additive_test.pdf

Used oil at 200:1 should no improvement.


I question this test because they used the old oil at such an incredibly low ratio. Most folks I know, run 2 gallons of it per 30 gallon tank, not a measely 16 ounces!!! At even 1 gallon per tank, it would save you 4 .50 in cost of the Stanadyne (which was directly above the used oil in the test results) while providing the same (if not higher) lubricity boost. Also saving you the cost of the gallon of diesel fuel it displaces in the fuel tank. Engine runs just fine on this. The GM 6.5 turbodiesel is the only diesel engine I know of that you CANNOT run used oil in. This engine comes with an optical sensor in the fuel pump, there may be other engines that use these, I dont know.
Personally, I'd be a little scared to run used motor oil in a CR or Powerstroke diesel myself-but an older mechanically injected fuel system is much more forgiving, & I run 200:1 TCW-3 in both my Stanadyne IP equipped engines, the 6.2 GMC & the 7.3 IDI Ford.
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