Jedi54

iTrader: (7)

new transmission has about 1,000 miles on it now and I think I'm going to try MT-90 this time around.
Hmm... gotta go check redline's site to see what goes in the diff...

danielk015

iTrader: (1)

i have redline in both for about a month now and it is great IMO... I was going to go with RP but the shop owner recommended against it, something to do with messign up the synchros...

ivory8

what about nearly all year round hot temps?

mikeferz42

rp messing up the synchros? anybody with rp have this problem yet? im changing to rp tomorrow morning so this concerns me.

mysql101

the shop owner has no clue.

I ran redline for 30k miles or so, then rp for 15k or so. car runs about the same with both, but a little better with rp when it's still cold.

danielk015

iTrader: (1)

he just recommended against it as the few weeks prior to me bringing in my 8 for the transmission oil change, he had 2 8s in that got transmission replaced that was running RP for a long time... he was just putting two and two together.. he did not guarantee soemthing bad would happen, just that there might be an increased change... go for whatever you feel is better, but why take any risk if RP is just a little better...

dillsrotary

^^ i can believe that, i'm draining my RP next week, i've been gettin high rpm grinds with 4th gear with it. Replacing it with redline shockproof heavy, we'll see but man i really don't wanna go through the trouble of a new tranny.

Jedi54

iTrader: (7)

I'll shed some light on this... It was I who talked to Yoshia at Neptune speed about the issues I'd had with RP and my transmissoin.
In that day was another forum member who had switched from RL to RP and that very day he began experiencing grinding at high RPM's.

His car had the RP drained out and filled with oem fluids, I had my differential drained of RP and put Redilne in. (since I knew I'd be putting Redling in after I logged a couple hundred miles)

Disclaimer: I am NOT saying that Royal Purple is a bad fluid...simply stating that I had issues with it as did a fellow forum member who I know. For some reason, at high temps, and high revs, the RP was somehow causing grinding. Yoshia commented that he's normally a fan of Royal Purple but that our two cars were not the only 8's he'd seen experiencing some issues with RP. (for those who don't know who NeptuneSpeed is...it's THE Rotary shop in SoCal)
Mazda replaced my entire transmission...

danielk015

iTrader: (1)

^^ Jedi, was thinking about dropping your name in my post, but didnt want to just bring you into it... That is what yoshia told me as well, the gringing in high temps and RPMs...

And yoshia does know a thing or two about rotaries...

mysql101

the problem is your low sample rate, and the fact that rx-8s in general can have transmission issues out of the blue.

if you did a poll, I bet the overwhelming majority run rp with no issue at all.

Jedi54

iTrader: (7)

very true mysql, but here in SoCal those aren't the only samples.
I'd still recommend RP to those who want to use it (it has a GREAT reputation) but if they ask me, I'll tell them about my experience and let each person make their own decision.

Same as I did with daniel when I saw he was going to use RP.

danielk015

iTrader: (1)

^^agreed... again, i dont think anyone is saying RP is automatically bad, just stating what we heard and what a few people have experienced.

Jedi54

iTrader: (7)

speaking of neptunespeed....I need to go back there next week to get some more stuff done.