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Will it be ok short term? The car is running perfect!!

So long as it doesnt over heat it wont really do anything. Keep an eye on coolant level.

Well it has to be either water, oil or fuel.

You can get a test done at a garage, where they use a sniffer thing (cant remember actual name) over your radiator (cap off) to see if any fuel mixture is leaking into the cooling system. If not then at least you can rule out water.

Do you use the standard ECU or after market?

Maybe get a tune too, might save you some gas and solve the problem. Infact I would do this first.

A quite common failure on s4 onwards motors is the outer edge of the coolant seal groove on the end/center plates corrodes away and eventually cracks or bits fall off it causing leekage.

Especially common on motors from Japan as coolant/antifreeze is often not used.

Worst thing mazda ever did putting water seals on the plates, should have left them in the alloy housings which are more corrosive resistant. In fact i think they went back to this way in the rx8 but not sure.

What does happen to a rotary if it doesnt get its oil supply? I know its going to be bad but is it quick death or just wears out quicker? And how long will they run without the OMP etc before they die?

Just wear out quicker, but i\'ve heard several accounts of people not realising the omp wasnt working for tens of thousands of kilometres to no apparent effect.

In my opinion this statement flys in the face of common sense! With premix if you are drawing in more fuel you will also get more oil. The ratio will remain constant. At idle you will use less fuel and therefore less premix.

Yeah the ratio will stay the same with premix, whereas the omp will vary it, thats what they are trying to say.

So someone\'s done the maths to work out an equivalent to what the OMP puts out as far as premixing...?
I just wouldnt want to get it wrong.. although I could always just add more to be safe...
I do like the idea of being covered in case the OMP failed- and the idea of not having it and its little lines spoiling the veiw of such a nice lump..

Royal purle have done the maths for you - from their faqs;

A stock FD twin turbo 13B with the MOP oil injection system can typically use about one quart per 1500 miles under hard street driving. If this vehicle is getting 15 mpg, the gasoline to oil ratio is 400:1. If the oil consumption on this vehicle reduces to 1 quart per 2500 miles and fuel efficiency increases to 20 mpg, the gasoline to oil ratio increases to 600:1. The stock metering oil pump is a great system as it varies with throttle position (load on the engine). Pre-mixing has to be calculated for the ‘worst case’ that will be seen by the engine for that fuel load. Under racing conditions, that’s wide open throttle at racing rpms. This means that at idle, the ratio may be slightly fat (rich).

100:1 is actually a lot of oil, ok for a race car but i would say too much for a street car IMO.

Also as RP say above premix has the downside of forcing you to have a constant amount of oil in the mix, whereas the factory set up varys it.