Hey, I have owned my fc for a while and have never run premix in it. It still runs fine but should i be running it? I hear people talking about it but never knew much about it

 

why do you think you should run pre-mix before we go anymore in depth...Thats the real question

 

Well im unsure about when u should be running it, or why you guys do run it. Is the stock oil injection insufficent?

 

Well you, we should run premix or separated oil all the time. It's not a matter of oil injectors, even if the spray is uneven, it's a matter of oil fonction.
Inside the oil is meant to lubricate internals and cool the engine.
The injected one by OEM MOP is meant to lubricate the seals and to burn.
Mazda's design is customer oriented, how to sell a sport car in wich you have to fill the gas tank and and 2T oil tank?
Premix if you can.

Matthieu

 

So what you guys are saying is premix is a good idea in general? What sort of oil do u mix with it?

 

Yes it's the best for your engine.
Use 1 % 2 stroke oil for boat, rated TC W3.

 

How much do u normally need per tank?

 

For a full tank:

• S4 = 16 ounces
• S5 = 18 ounces

Basically an ounce a gallon.

What you need to know is, if your oil metering pump is working fine you do not need to premix. If it was disabled by the previous owner I would hope that they would have mentioned it when they sold it to you, but in the case that they didn't, they probably would have removed the OMP/hoses/injectors and installed a block off plate in it's place which you could see down by the lower radiator house on the left side of the motor.

There are those who supplement their gasoline with premix even when the OMP is working, but I do not know if there is any added gain in doing so. Maybe someone will answer that for me as well.

 

Yeah I never really knew much about the OMP system. And i noticed that my car doesnt chew much oil which is why i asked. In saying that the car runs fine

 

You premix an ounce per gallon, so if you put 18 gallons you are putting 18 oz. I have been reading threads on it, if you are wan to know more info just do a search and you'll find out there are many threads about it.

 

the guy i bought my rx7 didnt tell me and maybe that he didnt know either but... i found out later that i was suppose to run premix. because the omp had a block off plate and i had no omp or omp rod or oil injectors.

i always wondered what that screeching was from my car... good thing i didnt push it too hard... forum members told me that i'm going to shorten the life span going like that.... but i read up on the pre-mix. did a follow up and follow through and my rx7 is running strong again.

if you plan to run premix, its 2-storke or 2cycle. but i've been finding and using 2 cycle only. try buying a gallon or what ever you can get, and try using the synthetic blend. heard its better overall.

p.s.
fill the tank up at "E"
start with 2-cycle first, then fill the gas afterward

good luck

 

I've been using the Lucas Fuel Treatment in both my cars for quite a while now instead of 2 cycle oil. The Lucas burns cleaner and doesnt leave a residue on my rear bumper.

 

I would like the "you must run premix" people to show me unquestionable, scientific proof that it's better then the metering oil pump and injectors.

This can be in the form of a SAE paper, white paper study, or double-blind test you have done yourself on a series of engines.

None of this "I started premixing my 150K engine and it's suddenly better" stuff. Real proof please.

 

Dude,your motor has been beat to **** if your OMP was blocked off and you didn't premix. Those apex seals must be hurting.

A buddies OMP went out on his TII blow through turbo and the seals went out real quick.

 

I'm not by any means one of those people, but I have seen pictures of housings that you could tell were more worn on the outside than the inside because the oil from the injectors didn't get over to the edges.

I premix due to piece of mind that I don't have to worry about my OMP failing.

 

That's anecdotal evidence at best.

 

For original question: No, it's not at all necessary, though supposedly it might help lubrication and sealing for good compression. The amounts recommended by other posters are correct if your stock oil metering pump is disabled. Otherwise use half that amount. I wouldn't disable your stock pump, because if you ever forget to add the premix after that it could damage your engine.

Don't worry about it, it's not worth the trouble. Or at least focus on the important things before you try things like this.

 

Alright. So basically any 2 stroke oil is fine, everyone just has their preferences. I'm unsure if my OMP does work properly so i will start putting some in i think. Is it gonna hurt anything if i put some in with a 3/4 full tank?

 

Oh just for my own clarification is this like 10ml per litre? Can someone give me the metric ratios plz =D

 

I started using it at 60k on the GXL. Not sure if it helps compression, but the front rotor was running 120 and rear was 114 on the last test I did just about a month ago. Car has 119k on it now, still runs great and eats gas. I love it, whether or not the premix helped. I really dont see that its better, maybe just cleaner with the products we run on our cars.

 

Well, if it's 1 ounce to gallon, then that means a 1:128 ratio.

So 10ML to 1L would be a 1:100 ratio, or a bit rich.

 

You have oil injectors to inject oil...use them! Convert to 2-stroke injection if you're so worried about the inherent handicap of throwing 4-stroke oil into the tub.

 

guessing your omp is working fine. leave it alone unless you feel some urge to carry oil with you everywhere. mazda designed it that way. with that said, if you're going to remove the omp, i would go with the rating that others have mentioned and not some stuff from your local gas station or supermarket. mix at the recommended ratio. from the looks of it u have an s5. removing the omp has some other ecu issues. there are tons of threads on this subject. gl!

 

Me too. Much cleaner than the 2cycle oils that I'd used.

 

I really don't like the argument that Mazda picked this to make it more convenient for the customer. Logically, that doesn't make complete sense.

If they were looking for something more convenient, they would just mix the oil down the line of the fuel, possibly right after the fuel filter. That would eliminate the need for this *extra* assembly on the motor.

Like Aaron says, until someone can provide scientific evidence that premixing is better than the MOP, I'm going to stick with Mazda's decades of research and development.