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New RX8 R3 owner - need some advice

Old 01-02-2019, 11:57 AM
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New RX8 R3 owner - need some advice

So I just purchased a 2011 RX8 R3 and I am very new to this game.... bought the car for my son who loves these, and I am an old school guy that has rebuilt more than his share of SBC and BBC's....
But very new to the Rotary game... One of the first questions I have is what do I need to know about mixing oil with the fuel?? I understand the motor drinks some oil to lubricate apex seals, but am wondering what I need to understand for this car as part of regular ongoing maintenance... type of oil it uses, type of oil to premix fuel, etc... thanks in advance...
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Old 01-02-2019, 12:10 PM
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First welcome.
Second, read the new owners thread, then read it about 12 more times no really read this!
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Old 01-02-2019, 12:15 PM
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Will do, thank you!
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Old 01-02-2019, 02:23 PM
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Some people premix, others don't. I do. I add in the recommended dose of 1/2 ounce of premix per gallon of fuel, which is about 1:250. I use Idemitsu, but you can use any 2-stroke oil that meets JASO FC or FD. Don't add 4-stroke to your fuel tank.

As for oil, if you live in a cooler climate and you don't do more than monthly Autocross, 5W-20 conventional is fine. I sent in oil analysis twice to confirm. If your climate is hotter and/or you track your car, XW-30 and XW-40 should be used. I use conventional just because it's dirt cheap and does its job just fine, though some people use synthetic and it works just fine.

Just make sure you change oil often. I usually change my conventional at 3k miles. Synthetic can go on a bit longer, maybe 5k miles or so. Remember each oil change drains about only a little more than half of the oil capacity, so change often and keep it fresh.

Last edited by UnknownJinX; 01-02-2019 at 04:21 PM.
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Old 01-02-2019, 04:21 PM
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Who recommends 1oz per gallon ? Seems a lot

nearly half a quart if bone dry ?

Last edited by Sydo; 01-02-2019 at 04:24 PM.
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Old 01-02-2019, 04:22 PM
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Oops, a typo. I meant half.

Fixed it.
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Old 01-03-2019, 01:22 PM
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If it's a 2011 it could very well still be under warranty (mine is) so I would advise against pre-mixing. Use the OE spec 5w20 and keep it topped off. Check it every 500 miles or so, I probably add about half a quart every 1000 miles.
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Old 01-03-2019, 04:09 PM
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Funny how Mazda spec 5w-20 but 5w-30 in Australia
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Old 01-03-2019, 04:31 PM
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It's actually 5W-30 outside of North America and 5W-20 in North America.

It was supposedly done for emission purposes and to squeeze out last bit of gas mileage.

But again, 5W-20 is adequate for daily driving in cooler climates.

This is not an uncommon practice, BTW. Lots of car manufacturers do this.

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Old 01-03-2019, 05:43 PM
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Originally Posted by UnknownJinX View Post
It's actually 5W-30 outside of North America and 5W-20 in North America.

It was supposedly done for emission purposes and to squeeze out last bit of gas mileage.

But again, 5W-20 is adequate for daily driving in cooler climates.

This is not an uncommon practice, BTW. Lots of car manufacturers do this.
Wonder if that's why more engine failures are in US ? Also we only have 1 oil cooler on high HP engines and i believe with 2 coolers the oil pressure was reduced ?
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Old 01-03-2019, 06:54 PM
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Originally Posted by Sydo View Post
Wonder if that's why more engine failures are in US ? Also we only have 1 oil cooler on high HP engines and i believe with 2 coolers the oil pressure was reduced ?
What's the percentage failure rate of the 8 in the US versus in Europe/Australia? Curious to see. It's not like the 8 is regarded as a reliable car in Europe AFAIK.

If you look at Series I failures, there is a lot of places to go wrong. The crap ignition coils were one reason, and then there is the inadequate oil injection from 2 injectors, etc. I'd be curious to see how many daily driver cars in cooler climates actually failed from bearing wear from using 5W-20 oil.

Now if you visit a track, I have talked to an FD owner who has witnessed some Renny teardowns and said they have consistently observed much more bearing wear from using 5W-20 versus XW-50 oil, and that's not surprising as the thinner oil will break down at the high loads and temperature you see at a track.

As for oil cooler, that seems to be just a design choice with Series I. Series II has higher oil pressure and the MT ones still come with 2 oil coolers.
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Old 01-08-2019, 11:28 AM
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thanks for all the comments... can new members not post questions in other forums? minimum post requirement? thx
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Old 01-09-2019, 10:47 PM
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Welcome, There are 2 links in my sig, one has already been recommended. I like the other as well...
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