ei8ht

OK so this might be old stuff to some but......

I have a 09 GT, about 6k miles now. I ask the dealer about Premix,
and the reply was " never heard of it" !!! So what the deal here.

Where can I buy some in Northern Ohio and do I need it in the first place.

Thanks

mscamp02

iTrader: (3)

theres a group buy for some idemitsu (hope i spelled that right)

9krpmrx8

iTrader: (46)

Okay, I am feeling good today so I will post before you get bashed. There is a HUGE thread already with everything you would possibly ever want to know about premix but it is very cluttered.

Anyway, the 09's have everything (well, almost) that was missing in the 04'-08' RX-8's so it should not "need" premix but it can't hurt. Basically premixing is mixing 2 stroke oil in your gas to help with APEX seal lubrication during the combustion process. Your car has three oil injectors (vs. 2 in the 04'-08' RX-8's) so the apex seals should be getting enough lubrication but with the 09's being so young it has yet to be seen if it is necessary or not. But personally it can't hurt so I would get in on that Idemitsu (designed specifically for premixing a rotary) group buy because it is not available locally. Or you can hit up your local motor cycle shop and find a good 2 stroke (Amsoil Saber Pro, etc.). I personally use Amsoil in my SOHN adapter (won't work on an 09') and I use Lucas UCL in my gas.

You are running a cat and supposedly TC3W classed 2 strokes can hurt the cat converter so you might want to use something else.

Bigbacon

iTrader: (4)

Does an 09 really require it since they added another oil feed into the rotor housing?

9krpmrx8

iTrader: (46)

Well until one dies and we can see for ourselves we won't know. RX-7's had 3 injectors and premixing the gas was still needed.

robrecht

Nope, RX-7s only had a single injector, but it was in the center. Because of the hot side exhaust ports on the 8, 2 injectors were aimed at the sides but not at the center. This was corrected on the 2009 Renesis by keeping the two side injectors and adding back the center injector.

plain ole wanker

https://www.rx8club.com/series-i-tech-garage-22/gas-oil-premix-thread-99636/

9krpmrx8

iTrader: (46)

Duh!, Yes actually you are correct Robrecht (not on the MMO issue though). We (04-08') just lacked a center oil injector (why they switched to two and moved from the center is beyond me) . I was thinking they had four but I think the other two were in the intake tract. I will have to look (never owned a 7).

ei8ht

Thanks for the NON-BASH reply. I have done some reading up on it but
never found a good explanation about it.
I've had my RX8 now for three months, and it has taken me this
long to feel comfortable in tossing it about in traffic like I could in the
del Sol.

The more I drive it, the more I like it. And real snow tires helped a lot! LOL.

It certainly isn't a Honda that's for sure.

Jim

9krpmrx8

iTrader: (46)

No it is definitely not a Del Slow.

robrecht

They aimed the oil at the sides of the apex seal because the key advance of the Renesis was the use of side (rather than peripheral) exhaust ports. This meant that there was more hot exhaust focused on the sides of the apex seals. So the oil was aimed there. Also why more carbon tends to develop there, which is why some of like the idea of a cleaner being added to premix and not just 2-cyle oil, eg, MMO or even better FP+. Since the 'split' some Mazda engineers have blamed Ford for not realizing the need for a 3rd injector still directed at the center of the Apex seal. Yes, older RX-7s also had oil injected in the intake tract, where it mixed with the air.

9krpmrx8

iTrader: (46)

Ah, I see. How could Mazda, blame Ford?

robrecht

Because Ford used to own a controlling interest in Mazda.

9krpmrx8

iTrader: (46)

Oh yeah but I just wonder how much they were actually involved with the rotary engineers.

robrecht

Obviously they were involved enough that some Mazda employees think they can get away with blaming Ford:

9krpmrx8

iTrader: (46)

That sucks, it really did some damage to the brand and further fed the idea that rotaries are not reliable.

DarkLord7854

The previous years don't *need* it either, it's highly recommended you do, and will do nothing but benefit the engine, so the real question is:


Why wouldn't you premix?

jmc23200

Or those people at Mazda figured Ford would make a really good scapegoat and no one could ever prove who's fault it was. "Oh ****, we fucked up. Hurry up and blame Ford before they buy Mazda Shares again and we have to pretend to like them."

Or Ford really did mess it up. I'm hoping the 09's and on don't have the same flaws. One year down, two more to go.

9krpmrx8

iTrader: (46)

Yeah, great question. Too bad I didn't learn on my second engine. I only ran a heavier oil and did not address premixing. It lasted 75k and I am certain if I premixed it would have lasted quite a bit longer.

jmc23200

I'll be switching off of 5w30 now that I feel my engine has been fully broken in(about 5 or 6 thousand miles). Going to look into 10w30 and 0w40. NE Winter might make me use 5w30 one more time though.

9krpmrx8

iTrader: (46)

0W is your friend 5W-40 may be the best of both worlds but testing a batch is the best way to find out.

robrecht

Actually, I was saying the same thing. Just 'cause they were blaming Ford doesn't mean it was actually Ford's fault. But Ford was involved enough that they thought they could get away with blaming Ford.

robrecht

So what did I say about MMO that was incorrect???

CRO8TIA

Has anyone used Castrol R30 as a premix,maybe some one with some knowledge of compatibility can shed some light on the possibilities of using it.Us older guys will know why I ask.

CarAndDriver

Was curious too, didn't see anything wrong?