just don't premix at all ........

 

You can't afford an extra $2 per tank? What are you doing with an RX8? It's bad on gas before you even get to maintenance items and cost of neglect.

 

Most RX-8 owners have never even heard the word "premix". And most RX-8 engines don't have major problems. Draw your own conclusion.

 

I'd wager most RX8s produced are already off the road :/
Of course as long as its just opinion and no data, nobody really knows!

 

 

So basically the same gas price as British Columbia, Canada. Nothing to see here.

And to answer your question, I'd personally say no then. Either you do it every tank, or you don't do it.

And no, the premix isn't there to burn off the carbon. It's there to (at least theoretically) help with the lubrication of the seals.

And I hope you at least have some reserve cash for a new set of coils and/or spark plugs. Skip the maintenance on this car and it will leave you stranded, fast.

I mean, if you don't count those with failed OEM coils...

Or failed apex seals due to the inadequate oil injection rate on S1...

Or clogged cats...

Okay you know the punchline.

 

 

That's about how much it costs here too. Maybe a bit more expensive. You only need about 250mL per tank, so $2.50 max? Price of a coffee.

 

Try and see if you can buy a case of 12 or some other higher quantity. They may give you a bulk pricing, and it's not like these things expire quickly. If you don't want them anymore, sell them to someone running a 2-cycle engine.

I mean, I pay CAN$240 for a case of Idemitsu Premix, but it takes me more than a year to go through them. You don't need that much, 1/2 ounce of premix per gallon of gas(or 4mL of premix per L of gas)is recommended for street use for those of us who run it.

 

Once every fifth tank will not do anything useful. Be more concerned about your ignition / cat health. Failures in those areas will kill your engine much more quickly than seal wear.

 

I do the same, I order a case from Mazdatrix and it lasts me a year, its around $100 including shipping. I drive about 10K-12K miles/year.

 

With the CDN down the drain, trade war and expensive shipping for liquid, it's still cheaper for me to buy in Canada.

They also ship pretty fast. Gets here in a day.

 

Also remember it does't have to be Idemitsu. Any JASO FC or FD two cycle oil will do the job. I use Lucas and buy it four gallons at a time. It costs me about $110 per year.