2 stroke oil in Diesel

Submitted: Wednesday, May 04, 2011 at 16:58
ThreadID: 86074 Views:11986 Replies:10 FollowUps:13
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Did some reading up recently on adding 2 stroke oil to diesel fuel in ratio 1:200. I decided to try it in my 96 4.2D Patrol (non turbo) and the result has been outstanding. The engine and injector pump are running much quieter, particularly at start-up. I have only done a few k's so far but fuel consumption seems to be reduced by at least 10%. Early days, but we are heading over to Perth and then the Kimberlies from Tassie next week, back in August. Will post a report on the results when we return, but definitely running better and much perkier on the throttle. Has anyone else had good or bad results from this mix?
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Reply By: Member - Redbakk (WA) - Wednesday, May 04, 2011 at 18:16

Wednesday, May 04, 2011 at 18:16
I am with you on this one, Tom......I now have been using castrol Activ 2T Jasco FC for some time now at the rate of 200 ml per 90 litres.
Last year I towed a 2500kg caravan from Bunbury to 80 mile beach and back and have noticed savings in fuel consumption and not that you would get too excited about it.

I have the benefit of having a certified weighbridge where I work and the other night I weighed the Troopy by itself and all the gear I carry in her and she weighed in at 3190kg's.

So add that to the caravan weight and my fuel consumption was around 3.5 to 3.8 kilometres to the litre.........however since adding the 200 ml per 90 litres and towing she has gone up to 4.2 to 4.6 kilometres to the litre.

As I said nothing to get over excited about but I'm happy.
AnswerID: 453288

Follow Up By: Brian Purdue - Wednesday, May 04, 2011 at 18:52

Wednesday, May 04, 2011 at 18:52
You are not excited about that increase? If I get better than 10% on anything I am very excited these days. I only get 5.5% on my Interest Bearing Deposits.
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Follow Up By: Member - Bruce C (NSW) - Wednesday, May 04, 2011 at 19:50

Wednesday, May 04, 2011 at 19:50
Hi Redbakk,

That's a drop of 4.5litres per 100 kilometres. Pretty dam good in any ones book there redbakk.
Or near enough to $7 saved every 100k.
Well worth the effort to get it mate.

Cheers, Bruce
At home and at ease on a track that I know not and
restless and lost on a track that I know. HL.

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Reply By: Whirlwinder - Wednesday, May 04, 2011 at 18:28

Wednesday, May 04, 2011 at 18:28
I have been using Castrol 2 Boating super outboard oil ( note that it must be for water cooled engines) for about 2 years in our 80 series 1HZ with after market turbo. It had done 231000 kms and is running better than ever. Quieter and smoother too.
AnswerID: 453291

Reply By: Member - Brenton - Wednesday, May 04, 2011 at 18:45

Wednesday, May 04, 2011 at 18:45
Have any of you guys been doing this whilst using a fuel additive? I usually use one but did not want to run both at the same time if this is a waste or could cause damage. Thanks in advance for any comments.
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Follow Up By: Hairs & Fysh - Wednesday, May 04, 2011 at 19:05

Wednesday, May 04, 2011 at 19:05
Hi Brenton,
I have, using Chemtec Power Additive.
Been using ATF as well as chemtec, for over two years now.
Haven't used 2 stroke oil. Change my fuel filter every 10 000 k's, and checked every 1000k's for any crap.
It defiantly makes the old girl quieter.

FollowupID: 726071

Follow Up By: trainslux - Wednesday, May 04, 2011 at 21:54

Wednesday, May 04, 2011 at 21:54
Just as some information for you to ponder.

2 stroke is designed to burn, and offers excellent lubricity.

ATF is an excellent oil but its not designed to be burnt, and its composition leads to burn deposits that are produced that may not be beneficial to your motor injector tips etc.

Agreed, the benefits of adding oil to the diesel to help with lubrication.
However I think that 2 stroke oil, which is designed to be burnt is a better option.

Just a thought, I realize you have used atf for some time and are happy with it.

I think 2 stroke could be better.

If you wish to use atf, thats fine, but thought I would offer my thoughts as a middle aged mechanic.


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Follow Up By: Hairs & Fysh - Thursday, May 05, 2011 at 11:06

Thursday, May 05, 2011 at 11:06
Cheers Trains

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Follow Up By: River Swaggie - Saturday, May 07, 2011 at 18:20

Saturday, May 07, 2011 at 18:20
"I have, using Chemtec Power Additive. "

Yeah i agree its good stuff...
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Reply By: Member - Scott A (NSW) - Wednesday, May 04, 2011 at 19:41

Wednesday, May 04, 2011 at 19:41
So you guys recommend giving this a try ?
AnswerID: 453295

Follow Up By: eighty matey - Wednesday, May 04, 2011 at 20:45

Wednesday, May 04, 2011 at 20:45
It sounds like it's ago. No negatives and Redbakk is saving about $7.00 for every 100kms. Even if I save $4.oo every 100km, that's a carton a week for a 1000km week. Free beer!!!!
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Follow Up By: gbc - Wednesday, May 04, 2011 at 20:46

Wednesday, May 04, 2011 at 20:46

Make your own mind up. The older diesels seem to enjoy some better mileage. I've used it at 200:1 in the colorado for the last 70 000 kms. I don't notice any better economy or performance, but it certainly lubricates the pump and makes the injection system run more smoothly.
I've been a member of a couple of forums discussing this aver the last few years.
The main reason for running it is to replace some of the lubricity which was lost when low sulphur diesel was introduced.

The general gist is:

Use only low ash mineral based 2 stroke oil (I use castrol 2t), as this happily stays suspended in diesel whereas the synthetics tend to fall out.

Cars under warranty to stay away from marine two strokes - it contains dye which isn't ideal for other warranty issues etc.

200:1 seems to be the right mix.

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Follow Up By: Member - Scott A (NSW) - Wednesday, May 04, 2011 at 21:05

Wednesday, May 04, 2011 at 21:05
I used to run Castor Oiil when racing Off road buggies (as a top end lubricant due to engine being flogged all day long)) at a similar ratio.

Thanks for the specific follow up gbc, I'll give it a go purely for the lub effect. Improved fuel economy would be a bonus, cause I love your way of thinking "eighty matey"

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Reply By: hoffy - Wednesday, May 04, 2011 at 21:36

Wednesday, May 04, 2011 at 21:36
I've been using 200:1 in CRD Jeep (Benz Engine) for 12 months and agree with others, Quieter, smoother power, minor improvement in fuel consumption.
The one thing that stands out for me is the reduction in EGT. I have a digital gauge fitted below the turbo and seeing 40-50 degree drop in temps on the same highway trip when using 2 stroke oil in fuel.
The cost of the oil is easily outweighed by the savings in fuel.
It works for me.
AnswerID: 453306

Reply By: trainslux - Wednesday, May 04, 2011 at 22:11

Wednesday, May 04, 2011 at 22:11
I use non synthetic 2T 2 stroke oil in 200:1 ratio in my vehicle, and have done so for some years now.
Better milage, .5 to 1ltr/ 100ks improvement, quieter motor, smoother on load.

Of interest.
Non synthetic stays in suspention in diesel, some have found using synthetics that it can drop out of suspention.

I also used acetone both in petrol and diesel vehicles with excellent results as a fuel system cleaner, and on the petty motors, specially the ones with long intake manifolds with a carby, the improvements were excellent, it basically acts like a wetting agent for the fuel, thus the atomisation of the fuel is better from the carby, and you get a more complete combustion of the fuel, ie smoother and better power/ economy etc.

Also, all fuel companies add lubricity to their diesel to pass a certain standard.

At 200:1 your not going to harm any components in your fuel system, infact adding a bit more lubricity to the fuel can only be a good thing.



AnswerID: 453313

Reply By: Ray - Thursday, May 05, 2011 at 07:34

Thursday, May 05, 2011 at 07:34
I have been using 2 stroke oil as a lubricant for upper cylinder lubricant for years on my petrol/gas 80 ser. I wonder how adding 2 stroke to the fuel will work.?????
AnswerID: 453320

Follow Up By: trainslux - Thursday, May 05, 2011 at 10:10

Thursday, May 05, 2011 at 10:10
Not in petrol, keep it in your upper cyld lube delivery system.

Better to use acetone in your fuel to act as a wetting agent to the fuel, gives better atomization of the fuel, cleans your fuel system too.


for dosage.

Hope that helps.

As its in such low concentrations it wont harm your fuel lines.

Have used this for the last 7 years on my petty vehicle and no effect on my rubber fuel lines.



FollowupID: 726128

Follow Up By: Trev6 - Thursday, May 05, 2011 at 18:41

Thursday, May 05, 2011 at 18:41

Would you use both Acetone and 2 stroke oil at the same time or just one or the other on it's own?. Would the acetone help a 1HZ 80 series

FollowupID: 726158

Follow Up By: trainslux - Friday, May 06, 2011 at 13:18

Friday, May 06, 2011 at 13:18
Hi Trev6

I will answer your question, but will say this first.
haha, should have been a politician hehe.

I have used acetone in both petrol and diesel to good effect.

With the older carby petty cars, ie old valliants with long intake manifolds etc, the acetone really improved the cars running, particularly when cold.
And as an added benefit, it also cleans your fuel system removing varnish etc inside the carby and manifold.

With Diesel, it also helps with atomization of the sprayed diesel from the injector tip, a greater benefit can be gained if the injectors are not working as well as they could and the spray pattern is not quite right with higher mileage injectors, it also helps good injectors by enabling a finer spray/ atomization, thus better burn.

It also cleans away varnish and gum that can buildup, sometimes being the cause of poor spray patterns.

It also absorbs water, thus it will carry water thru the fuel system and to the injectors where, if alot of water is carried there, can damage the injector nozzles and pump.

So I say, Yes you can run 2 stroke at 200:1 in your diesel, as well as acetone at the same time.

Saying this I would recommend before using acetone to check the water drain on your fuel tanks, and make sure they are running clean.

Then check any water traps you have on your filtration system ensuring they are free from water.
Then yes, run the acetone as per ratio in the link in one of my posts.

I have noticed a reduction in black smoke on load, and better fuel burn when using acetone only.

The main reason I used acetone in diesel to begin with was to ensure my tanks were free of any moisture. I used it to enable the water to mix with the diesel and be burn, as it was a very small amount after checking the tanks and water traps etc.
It also had the benefit of better running and fuel burn too.

Hope that helps you make a decision.

I use 2 stroke all the time, and run some acetone every other month just to remove any moisture that can build up in the tank when it naturally breathes as your fuel level gets low.


FollowupID: 726203

Reply By: downtools - Thursday, May 05, 2011 at 10:30

Thursday, May 05, 2011 at 10:30
G'day guys,

I too have been using a 200:1 mix of 2 stroke oil in our 2004 4.2 nissan.
I don't keep accurate enough records to say for sure the economy has increased although my best guess would be 0 to half litre per hundred klms better.

I ran out of 2t oil and didn't bother about it. till I noticed the engine was noticibly noisier.

The old girl is back on the 2 stroke and sounds happier!(quietier)

I think it works.

AnswerID: 453335

Reply By: Ron H - Thursday, May 05, 2011 at 22:47

Thursday, May 05, 2011 at 22:47
Have been reading many a post on this subject, and this thread was one of the few negatives.

Has a few interesting facts and some total incorrect data..... Decide for yourselves either way!
AnswerID: 453386

Reply By: Ron H - Thursday, May 05, 2011 at 23:19

Thursday, May 05, 2011 at 23:19
Oh , and forgot to ask , what about using kero instead? , much cheaper!
AnswerID: 453389

Follow Up By: trainslux - Friday, May 06, 2011 at 13:20

Friday, May 06, 2011 at 13:20
Kero has even less lubricity than diesel.
Adding it would only help if you are in a cold climate and want to lower your wax point of your fuel.

check BP's website, it gives the ratio of kero to add to diesel to make alpine diesel.
That is its only benefit that I can think of.

FollowupID: 726205

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