lunardeathgod

I know its supposed to but ever since I bought my fc it doesn't seem like it wants to burn oil, or I haven't noticed it burning oil.

So can this be a problem? My fc seems to be running fine since I bought the car (5 months ago)

daviddeep

iTrader: (4)

If they're running properly, they don't burn a ton of oil. In my experience with stock NAs, they will consume maybe a quart or so every 3000 miles depending on how hard they're run.

That said, if you're running it every day and it hasn't consumed any oil after five months, you probably have something wrong with your OMP. Do you know if it's still connected? Was the previous owner premixing?

lunardeathgod

Im not to sure, I was going to check on that tomorrow morning. And I would hope the owner before me told me if he was premixing,

Justen

iTrader: (12)

Its actually quite desirable to have an rx7 that DOESN'T burn much oil
Consider yourself one of the lucky ones

Its normal to burn a little bit.
Depends on how much you drive the car and how many miles you've put on it in the past 5 months.
May also depend on the weight and viscosity of the oil in the car. A heavier weight of oil will probably burn slower.

Justen

iTrader: (12)

yea check your OMP, just for peace of mind if nothing else

LunchboxCritter

iTrader: (9)

You should treat your rotary like a 2 cycle engine. It pumps oil into the housing to keep it lubricated. If your OMP system is not functioning or is disconnected you need to premix 2 cycle oil with your gas, or you are going to experience premature engine failure.

What year is your car? S4 (1986-1988) or S5 (1989-1991)

S4's have a mechanical OMP
S5's have an electronic OMP - limp mode occurs if the omp is disconnected I believe

Your car should be consuming roughly 1 quart of oil per 1000 miles of use (unless you're premixing and OMP is disabled/blocked off). This is normal, anything too far one way or the other and something is wrong and should be addressed.

jjwalker

My freshly rebuilt S5 with functioning OMP burns very little oil. I thought that maybe my OMP wasn't doing its job, but one wiff of the exhaust and yeah...it's doing its job.

arghx

iTrader: (3)

The "1 quart per 1000 miles" thing is a rough rule-of-thumb. Assuming the OMP is functioning properly, it still depends on how you drive it, whether you are turbo or non turbo, and whether you are s4 or s5.

The s5 electric OMP consumes less oil than the s4. The s5 OMP is computer controlled and takes into account engine airflow when calculating how much oil to deliver. The s4 OMP is mechanically controlled and delivers more oil than is really needed for a stock or mildly modded car.

lunardeathgod

I have an s5, and it is my daily driver, but i don't put that many miles on it.

I probably have gone 1k miles on it since my last oil change, and I havent needed to add oil. (i was using 5w-30.)

and what should I check for when I look at the omp?

jjwalker

If you where having OMP problems in an S5 you'd damn sure know it. Trust me on this, been through it.

I really wouldn't be all that concerned. Smell your exhaust, you should smell a bit of oil in the gas once it is warmed up good. It doesn't quite smell like a weedeater, but it has a distinctive burned oil smell.

I must also ask why you are using 5w-30 in San Antonio? Hell, I run 10w-30 in the winter and 20w-50 in the summer.

lunardeathgod

it was recommended by friend who drives an rx8. I was running 20w-50 earlier in the year. And I was expecting it to be colder than it is now.

and the exhaust does have a different smell than usual (compared to combustible engine)

jjwalker

The RX8 has different tolerances thus different requirements.

Well, if your exhaust smells funny, then I'd say stop worrying, drive the car and have fun.

gawdodirt

I thought the idea of a multi-viscosity was to cover all the temp extremes. That is why there is a chart in the manual? So you can pick one oil viscosity for all year.
10w-40 sounds like your best option to me. I run 15w-40 Delo as diesel oil has been found to be a great choice for hard run rotary engines.

Also need to be careful if the car has a cat still as the soot from the oil will contaminate the brick.

So, more oil is better for longevity, but worse for combustion and catalytic components. Balancing act.

GD

rx7racerca

iTrader: (1)

What series and engine? S5 (na, at least) doesn't burn much oil unless run hard consistently, so a lot of highway cruise will see very little oil use. Mine generally uses less than either of our daily drivers (Passat VR6 and Saturn SL2); even with 12-14 auto-x's a year, I rarely add any oil between oil changes (at 4-5000kms). S4 will use significantly more, and normally should see significant oil use in a 5000km interval.

durtled

if ur omp wasn't working in 5 months i think it would be in real bad shape by now.

batmanfc

I didn't realize the that limp mode would occur on the s5 cars if the OMP was not hooked up. That being said if an s4 car has an s5 engine and the OMP isn't hooked up it shouldn't make the car go in to limp mode because the s4 ecu didn't control the OMOP in the first place correct?

satch

iTrader: (1)

Correct.

batmanfc

Thanks. I thought so. It made since but just wanted to double check.