Miscible oil and diesel


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miscibility problems of stable and homogeneous mixture of diesel and vegetable oils

Keywords: blends, blend, oil, fuel, gas oil, diesel, viscosity holding risks additive.

This article is intended for all users of pure vegetable oil or rolling frying mixture.

Recently, many users of mixtures GO-HVP found mechanical problems on their injection pump.

The reason: it seems (it is checked) that the new gas oils (large oil company) contain an additive that allows more good miscibility vegetable oils.

Here is the testimony and testing of 2 pure oil users. Click on the photos to enlarge.

1) First witness: Miscibility tests, viscosity and stability over time achieved in the winter (end 2005) by -2 ° C with fresh cooking oil.

The author compares 3 mixtures (the letters are shown in the pictures):

1) P = 50 50%% oil + oil
2) D = 50 50% +% diesel oil
3) H = pure oil

When it comes to oil, it is actually kerosene used in auxiliary heating stoves (and sold up to 2 € / L in passing!). It is a product that is at the level of refining, so "heaviness", between diesel and gasoline. It looks a lot like kerosene.

The oil is a mixture of different oils of new fries: rapeseed / palm / sunflower. This is often the case for frying oils, they are sold already mixed!

Results in images after 2 weeks homogeneous mixtures were still nearly -2 ° C.

It is clearly seen that the oil has reached its cloud point long ago. This disorder effect is completely canceled by the kerosene and to a lesser extent by diesel.

mixing vegetable oil and diesel

test oil and diesel mixture

diesel and oil miscibility test


Conclusions: holding mixtures in winter and after 2 weeks is almost complete. The start of oil solidification shows that it is very risky to drive at 100% oil in cold periods but the frozen oil again became perfectly fluid when mixed with kerosene.

2) Second testimony: miscibility problems with new gas oils (June 2006)

partial source

The author shows that miscibility would be more correct with new gas oils! This testimony is for now the only and will be confirmed later. Tests are ongoing, incompatible diesel mixed with vegetable oil?.

"(...) the fuel has changed appearance, smell and additives; if you have not noticed, know that your diesel is not the same as a year ago.

It foam least you will say, moreover it comes with an anti-foam additive, but it is mostly become different to try to prevent the vegetable oil additions.

How, that's another story, it is certain that the addition of rapeseed oil (the cheapest and most used) in the current diesel blends evil and the fuel pump does not like mixtures inhomogeneous, it creates a stir with pressure changes and the destruction of the pump becomes a sad reality !!!

Already 4 people have reported to me serious problems in the engine (2 injection pump destruction on old cars), so I'm left to myself a little test (analysis follow).

The two vegetable oils that have served to test:


Both of these oils were bought at a super market "Discount" famous for its low prices (0,85 and 0,89 euro).



Now here is the result of the addition of these two oils in the current diesel:


In the left tube was added rapeseed oil, as one can see the bottom is lighter (Rape) the top (Diesel) and in the right tube was added Tournessol oil, miscibility is better but far from perfect!

To accentuate the appearance of the mixture, a slight coloration of diesel was conducted in the two tubes:


As you can see, the oils do not mix very well in both cases, but especially in the first tube which received rapeseed oil!

The final result after mixing with stirrer and a little rest:


No comment.

Conclusion: Although I think it is not necessary to conclude the evidence is there (you can check for yourself if you wish), Rapeseed oil is a banned !!! As for oil Tournessol, only time and testing on your part will tell us; but I recommend caution.

Adding 1% of paraffin oil in the mixture Tournessol / fuel improves the homogenization of the mixture (no effect with rapeseed) ...

More: Diesel oil and incompatible?


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