Hello all, I am a new rotary person and picked up my rx8 2 nights ago. A dream come true. At night i am dreaming of gas stations and selections of oil for the rice burner.

I was told not to put synthetic oil in this motor..ever..at some point when my hair turns all grey my engine will meet the apex seal God.
What is the deal with this because there is a large number of vendors out there promoting the virtues of syn in a rotary engine, royal purple and amsoil to name a few.

also my rotary saleman said he runs 1030w dino oil but the owners manual calls for 5-20???

He also recommended mixing a little oil with the gas at each fill-up and everything out there tells me to use tcw-III oil which is generally the same as what i am using in my outboard.
Anyone know the # of ounces to use with 16 gallons of fuel at fill-up time? I have heard anywhere between 200 to 1 or 800 to 1 ratios work.

 

I use 5w30 synthetic oil because I have a turbo and synthetic oil is good for FI, I have never heard of putting oil in the gas tank I don't know how true that is.

 

try the search button. it's been asked here way too many times to count.

 

I have 28K miles on my car. I use 5W20 Castrol oil in the car.
Some people find that adding a little 2 stroke oil to the gas tank helps under hard acceleration. I used to do this with my RX7 race car. I don't with the RX8. A couple of ounces should be OK. A quart per fill would be too much.

 

 

he's pretty much spot on.

10w30 is fine, so is 5w20.

putting 2 stroke oil in with your gas is called premixing. since your car is already injecting oil, you don't need much. about 4 - 5 oz should be plenty each fillup.

 

I like Redline 5w-20 and have many Blackstone oil reports showing very little wear.

YMMv,

Vince

 

Castrol GTX in whatever weight you think is good. Been using Castrol in every motorized thing I own except the 2-strokes.

NEVER have I had a prob!!!

 

Search and if you're too lazy to do that, stick some cooking oil in there.

 

Ah but, there is nothing like the smell of a 2 stroke motor with Castrol premix. It is unique.

 

read all of this. lots of good info here.

https://www.rx8club.com/series-i-tech-garage-22/cumulative-synthetic-oil-discussion-52856/

beers

 

Personally, all I can say is stay away from synthetic. Everyone I have talked says synthetic oil and the rotary just don't mix...kind of like oil and water (hmmm...nice reference, lol). I see Terrance uses synthetic, however he has a turbo setup so that may be different in his case.

 

personally you should read this thread also..

https://www.rx8club.com/showthread.php?t=52856

beers

 

Oil in the gas tank? I thought our car was a 4 stroke, not 2?! Something I don't know here?

I use Castrol GTX 5w20...

 

whatever they say, stick to what the manual said Mazda engineers knows best for your engine.

 

why would it be different. does the rotary engine burn oil differently with a turbo?

do the apex seals get fouled by royal purple without a turbo , but not with?

it's all a bunch of horshit. i use synthetic. royal purple. my engine passed the compression test with flying colors when I brought it in for the recall.

 

Old Synthetic Oil did had a problem with Old Oil rings like 30 years ago, but REMEMBER, THAT WAS 30 SOMETHING YEARS AGO.

Now ....

I've been using Synthetic Oil (RP, Adv Q, Syntec) for 23000 miles. My car has yet to blow up and kill me.

Adding 2-stroke motor oil is call premixing, very popular in the Rotary community. You can read my Premix Thread for list of some Premix oil (Im still trying to finish my Idemitsu, damn a whole case gonna take a long while!)

https://www.rx8club.com/showthread.p...remix+oil+list

I add about 5-6oz per fill up, add it before u start dumping gas in.

 

lots.

it is a rotory

beers

 

OK, Castrol GTX as tested is a really good quality dyno oil and rates better then many synthetics. Our motors inject oil into the motor to oil the apex seals, this oil is pulled from the crank case, hence why synthetic is not advised because they do not burn well, synthetic when burnt creates large amounts of carbon and can clog the cat. As for weight, that depends on your climate, mazda says 5-20 for emissions reasons, but a rotory can get very hot so a 5-30 in cold climates and 10-30 in moderate to hot climates is what we run in the the other RX serieses, like th 3,5, and 7.

Premixing is never bad, the proper mixture is 1/2 ounce to a gallon when the OMP (oil metering pump) is still connected and a full ounce to a gallon (a little more if you like) if the OMP is disabled. In my RX-7 I run just over an ounce a gallon, it just makes a bit of blue smoke out the back that is all.

 

I'd like to see some evidence for this statement, since synthetics will generally burn cleaner and with less deposits left over than dino oil.

 

I would like to see scientific proof in that one as well ? Wait I thought it has been proven that Synthetic burns cleaner than Dino oil ...

Nothing person ok? but Have you wonder why Synthetic has a bad name , thanks to people like you who spread nothing but rumors. Clog Cats? another new *rumor* ... Thanks alot buddy.

 

i use amsoil 5w20 with napa gold (wix) filters. No problems i noticed a smoother idle after putting it in. its been in for 7,000 miles.

 

It is just experience from us 1st gen 7 owners, we found that the synthetics just weren't as friendly in the rotory if the OMP is still hooked up. We never had any issues with seals tho, not that I can remember. I do now that (at least the old cats) didn't like some of the thicker oils and would clog, because motor oil isn't ment to be burnt. I do run synth 2-stroke oil in the 7 and it works better then the regular 2-stroke oil.

And on the topic of synthetic burning, the are engineered to with stand greater stresses so that would make them less burn able since you don't want you crank case oil burning anyway in a piston motor. I do have experience with that too, I had Mobil 1 Full-Syth 0-40 in a Celica GT-Four turbo with 360hp and when the rings went on it, the oil didn't burn it just came out the tail pipe covering my friends car while we went down the highway, made a mess of the exhaust and head too, took alot of cleaning to get it back in a rebuildable condition.

 

That's generally what happens when a motor goes; ever watch F1 engines grenade? The car behind (along with part of the track) gets covered in oil.

 

o rly..

this is a shot of a cat with ~35k miles with syn oil.. ~ 10 with premix....

the oil is not the same as the first gen 7s. 1978 i think.. mobile 1 was a problem for rotorys back then..

and the rest is blah blah blah.

food for the brain.
https://www.rx8club.com/showthread.php?t=52856

beers