why we should all premix:
 

i just posted this on my local car forum, check it out. i've been working on the FD for the past two weeks or so and had a startling discovery.

--prior to my work, i had an oil leak that i couldnt find. when i got these turbos and new UIM in the mail i decided "hey, i'm taking the UIM off anyways, i'll go through and do this non-sequential mod and try to clean some stuff up" well, not much to my surprise, i see oil puddled up on the block between the block and LIM... i immediately thought bad bad things because there are only two things on top of the block that get oil; the turbo oil feed line and the two oil injectors (FD's only have two as opposed to the FCs, which have four) upon further inspection, the rear oil injector had no oil line going to it. the line was broken off six inches from the injector! the MOP was simply pumping oil onto the top of the block. the oil wasnt even making it to the oil injector. next i checked the front oil injector; it was nearly as bad. the front oil injector line was broken as well, but had a rubber vacuum line attaching the oil injector to the point at which the stock oil line was broken off! of course this rubber had over the course of time become infiltrated, inflated, saturated with oil, so most of the oil probably wasnt even making it to that injector either. this is when i thought "carp, i need some oil injector lines"
--David Moore is the man (he is ids igloo here on rx7club) i called him up and said "guy 1, this is guy 2, would you happen to have any oil injector lines?" assuming that FC and FD oil lines were the same -which the stock ones are not- and he replied with "yeah guy 2, i have some stainless braded oil injector lines that i took off of my FC back in the day. i can bring them over if you want." i replied "guy 1, that would be phenominal, make it so."
--After all the fancy footwork of the oil line install -while skipping a few steps with the MOP replacement to make this story less boring than it already is- guy1 and guy2 persevered, bringing peace and harmony to the stock bullshit oil injection system that is the FD MOP and lines.
--upon completion of this small set-back i had in my turbos/UIM replacement project, guy1 and I thought, "how in tarnations is my engine not blown after being run with half of one oil injector for all of this time?" the answer is simple, yet complicated: i've been premixing every tank, but why? because its a rotary, an rx7 and an FD. you've realized that the previous owner probably didnt premix and was driving the car on half an oil injector, but there's really no telling when the line got broken; what i'm thinking is it, like the front oil injector, had a rubber vac hose supplying its oil like the front one did and maybe it just fell off recently. there is no way to tell for sure, but the compression is good and the engine pulls about 17" of vac, which is fine. any rotary running with NO apex lubrication for over a week will have lost most of its compression and be well below to 80psi rebuild limit.
--in conclusion to all this oil madness, all rotary people should definitely premix if they (or someone credible) havent gone through their lubrication system to ensure that everything is functioning correctly. i can have the peace of mind now to know that i have a solid oil injection setup, but i am still going to probably premix every tank. its great stuff!
--i'd post some pictures of the stock oil injector lines and the oily mess that they left me, but i really dont want to cry again. i really peed a little bit in my pants and cried when i saw this monstrosity for the first time :)

thanks for reading, guys! and go check out your stock oil lines and oil injectors asap!

there are people that dont premix?

i dont. but my car hasnt being going for over a year

I just checked mine the other day for some solenoid work. Still in one piece. I do often worry since they are so frail.

um i got a queston, how much do you put in with a full tank of gas?

Most put 4 Oz per tank I think.

4 to 6 OZs

How old were your MOP lines?

Idemitsu premix 1/2oz per gallon of gas.

+1, never seen one break. ive seen them broken when people (including me!) are in there "fixing" other stuff

A broken MOP line cost me a rear rotor and housing. They should be checked regularly. I premix once every couple of weeks. Good advice.

my stock oil lines were probably very old, and probably reused when the reman was installed (06/03)

good info.thanks for the heads up!

What kind of oil do you recommend using for premixing and what type do you use in the engine?

Noob question but what are the symptoms if you know the MOP might be going bad or is bad already?

I use Idemitsu premix made for rotaries.

wow. so little? when i first started, i was told 1oz to the gallon and 1 1/2oz if you're gonna romp on it. am i goin overboard?

...this happened to a friend of mine at about ~80K miles, car was bone stock; wire harness, solenoids and OMP lines were nice and crispy probably from always having had the original downpipe cat. Luckily he could smell the oil burrning before any internal problems, decided to rebuild anyways, things checked out okay when taken apart.

Where can you buy idemitsu??

Yes i would like to here from a guru also!:)

As it stands the rotary is designed to use oil, so I do check my oil on a regular basis, I do change the oil (not filter) every 1500 miles and filter every 3000, but there doesn't show any signs of the motor burning off any from the crank case, so I started running a premix. My FD does run better with the mix than without.
no leaks, or puddles in the driveway, but I will be checking and or replacing those metering lines.

Ashless two-cycle. I don't know, but have heard marine two-cycle oils tend to burn cleaner.
If the one or more of the lines break or begin leaking, there may not be any immediate symtoms other than an oily engine or stained concrete. If the MOP itself fails.....sensor or stepper motor and your still on the stock ECU, it throws a CEL and goes into limp mode.

rx7.com or mazdatrix.com

anyone have pictures or good diagrams of oil metering lines and injector location?

TCW3. Ive been using a 1 to 1 ratio for over 3 years now with no problems. Was using it in my T2 and now my FD. Smokes a tad bit at start up but other than that i havent really noticed any other serious smoking.