I know is a noob question but Ive heard it mentioned a few times and am curiouse. What exactly is premix and what is it supposed to help with?

Premixing is when you put 2 cycle oil in the tank. Make sure the oil is for injection systems. It helps to lube the engine. You can premix with the Oil Metering Pump "OMP", Or with out it. You use less premix oil with the omp still on. Im not exactly sure of the mix ratios.

you should do a search, i'm sure you'd find a lot of info on it. Its just the process of mixing a certain type of oil in with your fuel. Some ppl ditch the OMP and premix

I use the omp and still premix it can add like 10k miles extra to ur odemeter overall Ive herd.

As far as I'm concerned you can only do good by ditching the OEM oil injection, it draws oil from the pan. Every oil change you should be down one quart of oil.



That's 4 stroke oil and isn't exactly designed to be burned the way two stroke oil is. Regardless, a rotary engine needs lubrication in the combustion cycle differently than a general piston engine.



From OEM, mazda uses the metered oil pump to use the 4 stroke oil out of the pan. I believe this, myself, to be a marketing/warranty decision. It's tough to market a car that requires two stroke oil in the gas every fill up, and forgetting or using improper mixtures would void warranty and potentially cause engine damage.



Mazdas race team and many builders switch to premixed gasoline with two stroke oil for smoother performance, and less potentially harmful carbon deposits, which cause wear and tear from burning oil that isn't designed for the way a rotary engine will use it.



Mazda's factory produced design has been tried and proven to be effective even into higher mileage motors, but it is by no means an optimum setup. They did well considering they avoided the marketing and warranty issue, and didn't sacrifice an excess amount of engine life to make it work.



It's up to you which you want to do, but premixing is a more effective, safer, and cleaner form of lubrication as compared to burning regular motor oil. The catch is you have to mix every fill up which (for some) is too much of a bother.



A safe bet for street vehicles (as I've understood from discussions with other builders), is 8 ounces for every 10 gallons



An ounce per gallon was more of a race setup.



For metric, 250 mL is sufficient for about 40 L.



Make sure your premix is a reputable two stroke name and is TCW3 certified for fuel injected engines.

^^^Good advice!

The extra additives that are used in today's oils are not made to burn effeiceintly, well, they really don't burn much at all. Synthetic oils make this even worse.



There is a company that makes a kit, of sorts, that uses a reservoir that attaches to your fender well or firewall that will allow you to run a burnable 2 stroke oil through the omp, without the omp drawing oil from the pan.



This would be a benifit to a series 5 Rx-7 owner whom didn't want or need to have an upgraded or standalone ecu. For those of you who don't know, the ecu has a conniption fit when the omp is unplugged from the engine harness.



This still creates a hassle as the reservoir needs to be checked/refilled when you stop for gas, but curtails the overwhelming expense of changing engine management components just to have an engine that burns oil, instead of depositing it into your rotor housings.

Wait...I have a series 4 turbo, and I'm premixing with the OMP. Will I run into any ECU problems when I remove the OMP? Or is this just on S5's?

From what I read, it's an s5 thing.

yeah s5 is electronic and controlled by the ecu, S4 is mechanical.