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Old 07-16-2018, 03:42 AM
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Exclamation Question about premix

Hey guys, newbie here! sorry I didnít mean to create yet another thread about premix but I couldnít find an answer to the question i have
okay so Iím a student right, so fuel costs are kinda a big deal. Is it even remotely worth while only premixing lets say every 5th tank or so? I cant afford to premix every tank and i road rip a lot so yea
thanks in advance!
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Old 07-16-2018, 04:10 AM
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just don't premix at all ........
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Old 07-16-2018, 09:55 AM
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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.

Last edited by Loki; 07-16-2018 at 09:58 AM.
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Old 07-16-2018, 12:36 PM
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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.
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Old 07-16-2018, 12:39 PM
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Originally Posted by New Yorker View Post
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!
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Old 07-17-2018, 01:07 AM
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Originally Posted by Loki View Post
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.
dude here In South Africa itís about a dollar and a bit for one litre of petrol
Iíve liked the car ever since I was a kid and I got it for a really good price, I know Iím gonna struggle with costs for a bit but thatís Okay, when Iím out of school it wonít be as much of a problem. I just wanna know if adding premix every few tanks is actually worth something to burn the carbon build up off or if itís a waste of time
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Old 07-17-2018, 01:32 AM
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Originally Posted by mtb1102 View Post

dude here In South Africa it’s about a dollar and a bit for one litre of petrol
I’ve liked the car ever since I was a kid and I got it for a really good price, I know I’m gonna struggle with costs for a bit but that’s Okay, when I’m out of school it won’t be as much of a problem. I just wanna know if adding premix every few tanks is actually worth something to burn the carbon build up off or if it’s a waste of time
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.

Originally Posted by New Yorker View Post
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 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.

Last edited by UnknownJinX; 07-17-2018 at 01:34 AM.
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Old 07-17-2018, 04:18 AM
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Originally Posted by UnknownJinX View Post
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.
.
Thanks man
yea i have reserve cash, just really expensive to get premix here about R100 or like $6-7 for 750ml so yea 😂
anyway thanks for the help guys,i Appreciate it!
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Old 07-17-2018, 09:03 AM
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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.
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Old 07-17-2018, 02:25 PM
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Originally Posted by mtb1102 View Post

Thanks man
yea i have reserve cash, just really expensive to get premix here about R100 or like $6-7 for 750ml so yea 😂
anyway thanks for the help guys,i Appreciate it!
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.
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Old 07-17-2018, 09:27 PM
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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.
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Old 07-17-2018, 11:01 PM
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Originally Posted by UnknownJinX View Post
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.
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.
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Old 07-17-2018, 11:38 PM
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Originally Posted by Chrishoky View Post
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.
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Old 07-18-2018, 08:09 AM
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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.


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