have just purchased a mazda rx8 evolve ltd edit 06 plate 30000 on the clock when i was topping up the oil and had the dip stick out i noticed the oil on the stick looked as it had emulsified were it was a creamy coulour i then took off the raidiator cap to check it and the cap was spotless just to see if the water and oil were mixing together in case ther was a problem with the cylinder head , i would be more than grateful for any advice you could put to me just to put my mind at rest.

thanks guys much appreciated i will get this checked out asap

I'll be the first to admit I know little about the rotary engines. But In general, modern cars don't have PCV 'valves,' but an orifice inside a hose that can be cleaned. Use a small wire, carb cleaner or even a welder tip cleaner to force out the gunk. With that many miles on a rotary, I might also check intake manifold vacuum. From my understanding, these engine are extremely sensitive to regular maintenance and if not done, go downhill pretty quickly. Unless you have a full history on the car, assume the previous owner didn't do services as they should have been done.

thanks for answer to my querry Richard very much appreciated like yourself i know very little about rotary engines but i will be in contact with the garage before the w/end to see what they have to say about the problem

You're welcome. It sounded to me like you are experiencing condensation in the oil, not coolant. This would certainly indicate a problem within the PCV system. Don't let the shop rip you off, and hopefully you got some kind of used car warranty on this car. Based on the owners I've talked to, and owners post I have read, if you don't know about the rotary and its maintenance needs, you'd be wise to learn. Or expect to pay a lot to a shop to carry them out for you, and that can be costly and dangerous. They are much more delicate than you might think. Think '60's/'70's British sports car... say an XK E-Type for example.

my rx8 looks and performs very well and for an 06 plate it has only 30000 on the clock so hopefully this prob is not going to be to dificult to sort but i will get it checked out just in case, thanks again for all the advice its very much appreciated.

Usually a pressure test of the cooling system will tell you if the system is "air tight" Check harbor freight for the tool. or Call a local radiator shop, cooling systems are all relatively the same rotary or not.

thanks for the info will get it checked