2 stroke oil in Diesel (outboard oil)

Hello Joe

Modern diesel engine fuel systems have very close tolerances to achieve their very high injection pressures. The high injection pressures facilitate better atomisation of the fuel which leads to vastly improved economy when compared to older injection system designs. As well as providing the fuel source, distillate also cools the injection components and provides lubrication to the components. Adding outboard oil will affect the viscosity of the fuel and possibly lead to cooling and lubrication problems with the fuel system components. With older engines, one might get away with it. With modern engines, I would not touch the concept with a barge pole.
Fuel systems are marvellous mechanisms, but very very expensive to repair, especially modern ones.

That's the advice I would give my friends if they asked.

It should be no different to any other 2 stroke oil Joe.

It mixes completely with the diesel and provides the lubrication that is missing with low sulphur diesel, as you know from your research.

The only reason they say not to use 2 stroke oil is because it is dyed so manufacturers can tell if you've been using the recommended oil in their outboard. Obviously unpreferred if sending your vehicle in for logbook servicing. If it's for the beast in your avatar pic I'd be using it for sure. My colorado (common rail) has been on a 200:1 diet for nearly 80 000 k.m.'s now, so yes, I'm a confirmed user.

Have been doing it for a long time with no adverse reaction. Use a bit of Jet a1 in the girl and add the 2 stroke to this as well as the diesel. Coupla diesel mechanics I know have also ben doing it due to the sulpher(lack of).

copied fromn a European poster-(outright plagiarization)-

Read and consider in context with others on this site who have successfully used 2 stroke oil:

Due to the pollution control measures of the EC diesel-oil is nearly sulphur free and contains up to 5% of bio-diesel. Sulphur has the property to grease the high pressure injection pump and the injectors. Without sulphur, the reduced greasing property of the new diesel has already shown negativ impacts on the long-term stability of the injectors and the high pressure pump. The pump manufacturers have tried to react by lining the moving parts of the pumps with teflon or other suitable material. However, the long term stability is still not achieved as with the old (sulphor contained) diesel.

The engine-research centre of a well known German car manufacurer has conducted some long term tests of diesel additives to find out whether any one of them will have an impact on the long term reliability of the diesel engine components. This introduction to explain were my information comes from.
The results of this research: any diesel additive of any manufacturer presently on the market is not worth the money!

BUT: 2-stroke oil, which we use in our motor saws, lawn mower or in 2-stroke motor engines has shown to have an extreme positive impact on diesel engines, if such 2-stroke oil is added to the diesel in a homoeophatic dosis of 1:200. In practical terms: 0,300 litre of 2-stroke oil into the 70l diesel tank. The 2-stroke oil will be absorbed by the diesel (emulsion) and grease every moving part of the high pressure pump and the injectors.

Besides this, the 2-stroke oil will keep the diesel engine clean, as it burnes cleaner as the diesel itself.

In other words, the 2-stroke oil has a much lower ash-content as diesel, when burned. This proven fact delays the DPF (diesel particulate (soot) filter) to clogg, and the "burn free" process of the DPF will be much less.
One more information: in Germany we have to present our cars every 2 years to the TUV -Technical Supervision Organisation - who will check, amongs others, the pollution of petrol and diesel engines.
The measured cloud-factor of a diesel engine without use of 2-stroke oil has been 0,95.
The same factor with the use of 2-stroke oil has been 0,47 - reduction of nearly half of the soot particles.
Besides this, the use of 2-stroke oil in the diesel will increase the milage by 3-5%.
Rule of thumb- 400ml of 2 stroke in a 90 litre tank

Been thinking about doing this for some time now but yet to make the jump from Diesel Power additive to 2 stroke oil. There is a very lengthy read on this site with some contributions from some who seem to know their stuff. For me the jury remain out.......at least until the warranty period is over.

If I done my calc right 200:1 is 500ml for my 1993 GQ 150ltr tank I put 100mls in the other day & will increase it overtime so I can monitor any change that way if it's suppose to clean things inside the motor I don't want a heap of gunk suddenly loosening up and floating around the donk. I'm using STIHL 2 stroke oil because I already have it at home for my chainsaw ,mower etc hope it's ok for the 4X4

Hi Joe,

Yes I've used 2-stroke oil in my diesel Rodeo for a while now and have to say I wish I started sooner. I use Penrite Greenkeepers 2-stroke oil (which I also use for my chainsaws, etc). Normally at a 200:1 ratio (although I do chuck a bit more in ;)).

Quietens the engine right down. Being direct injection, she was fairly noisy at first but when I started using the 2-stroke, the noise dropped noticeably. She's been on it for around 2000 km with no negative effects.

In other words, she loves it!

Cheers,

Tim.

well i am happy to say i have joined the "vast believers" and added it, it is low ash so should be fine, does have a "colouring" added but that seems to be ok for the system by all reports i have read....
Will be doing a trip to Isa next weekend so that is about 1000+klms round trip so will see how it runs, i will look for some 200ml bottles so i can carry it and mix it "on the run" and not have any mess, i am lucky as i have heaps of it and i need to use it up..
Thanks for all the replys, yes there is hours & hours of reading about it and i actually have not found any "proven" negitive results, a few say it wont work and dont do it but no proof in the negitive (yet) ....
Cheers all n thanks
Joe