FTW RX7

im new to rx7's and did a oil change on it. i read in some rx7 magazine that synthetic oil is good to use in these motors. then today when i was picking up some parts from a local race shop. the mechanic their said it is bad because of the oil injectors, it wont burn and ruin your seals. is this true or is synthetic fine in the motor.
its an 87 rx7 n/a 13b

farberio

iTrader: (7)

High quality synthetics are a-ok.

jjcobm

iTrader: (18)

Synthetics are fine. I still prefer to run conventional oil since it always ends up getting diluted with fuel a bit anyway. No point in spending $10 a quart when your just going to change it at 3,000 miles again.

TheAbsence

iTrader: (19)

FULL synthetic is great to use in rotary engines. Synthetic blend is what we try to avoid due to their ash content. Cheap non-synthetic oils are great for any rotaries that are ever driven on public streets and Castrol GTX seems to be the forum supported oil for such applications.

iani1.1

iTrader: (13)

omp delete and then you can run any synthetic you like. just dont forget to premix.

Evil Aviator

About 20 years ago there were some synthetic oils that caused striations on the rotor housings, but modern name-brand synthetic oil is not known to have that problem. Top-quality synthetic motor oil is good for rotary-powered race cars, but it is not worth the money for a street car.
http://www.royalpurple.com/faqs-rotary.html
http://www.redlineoil.com/motorsport...px?id=87&mid=5

For my street cars, I like non-synthetic Castrol GTX in the engine, and Red Line synthetic in the transmission and differential. The RX-7 transmissions are rather notchy from the factory, and synthetic oil really helps smooth them out. I have used Red Line, Royal Purple, and Mobil One synthetic grease in the wheel bearings, and they all seem to have performed well.

Rx-7Doctor

iTrader: (13)

As soon as I saw this thread I knew it was a NOOB!!!!!!!!!!!!!!!!!!!!!!

Help us out here. In the future read the "FAQ" section! You don't these basic questions have been asked a thousand times over?

Right from the FAQ section-

Lubricants and Cooling
My car seems to use a lot of oil. How often do I need to check it?
Everytime you get gas, you should check your oil level. The Rotary motor by design is supposed to inject oil into the engine based on throttle position. If you keep your foot on the gas a lot, you will use more oil. It is normal to use about 1 quart of oil every 1000 to 3000 miles.


Can I use synthetic oils in my Rotary engined car?
Yes and no. Mazda officially does not recommend the use of synthetic oils in rotary engines, however, long term and racing use has shown that the better synthetics (Redline, Amsoil, Neo, Royal Purple, Mobil1) are perfectly fine to use in a rotary engine, and will generally result in a 1 to 2% horsepower gain. However use of poor quality synthetics (like Valvoline, Castrol Syntec, Havoline, Etc) will result in build up due to high ash content left from these oils when they are burned. It is believed that is why Mazda did not recommend synthetics, because the couldn't pick favorites.

Other notes:
The Mazda Factory racing departments recommend and use ‘synthetic’ oils including the winning 1991 Leman’s 20-G 4 rotor Mazda 787B.

MazdaComp USA printed manual (now Mazdaspeed) recommends the use of synthetic oils for racing conditions.

Redline, Amsoil and Royal Purple Synthetic Motor Oils have been used in rotary engines (both race and street) for ten plus years with excellent results.

Most Synthetic Motor Oil is compatible with the bearing material, sealing elastomer's, and combustion seals used in a rotary engine.


What oil should I use in the FC?
According to Mazda:
In starting and operating temperatures below 20F, use 5W30
In starting and operating temperatures between 0F and 80F, use 10W30.
In starting and operating temperatures above 30F, use 20W50

As far as brand any good quality oil that meets the API SL or SM standards should be fine.

xxifearixx

iTrader: (1)

royal purple lubricating my engine tranny and diff

batmanfc

What 2-stroke oil is best to premix with? I know it has to be made for fuel injected engines, but is there a specific brand that is best or used most often?

fidelity101

iTrader: (11)

+1

premix with some quality TCW-3 2 stroke oil 1 oz for 1 gallon and use whatever oil suits your application
I use the diesel oil from shell, rotella T 15w40

batmanfc

You use rotella 15w40 to premix with?

wjk0817

iTrader: (3)

synthetic or non synthetic. I was searching for an answer too a while ago, however, it's a never ending argument. Just depends on the persons perference I guess. I use 5-30 non syn, and my fc loves it

InsomniacFC

iTrader: (4)

I've been using the two stroke oil from Wal-Mart for years. Supertech? Cheaper than the gas station.

Edit: I use Castrol GTX 20w50 for motor oil.

tuscanidream

iTrader: (6)

True. But there are synthetic oils made specifically for rotary engines that due burn. I think banzai or some one carries them.? Idk. I'm on my iPhone. Search it up.

Edit: it was Mazdatrix that had the synthetic oil for rotaries. Just remembered.

Black Knight RX7 FC3S

iTrader: (7)

just stay safe and use good regular oil.
There is no use in using high grade synthetic unless you have a high performance rotary engine. Even then, people would still use regular oil like Castrol GTX.
If you really want to run synthetic, I would suggest you get a high quality synthetic amsoil, redline, Mobil1, or Idemetsu. These oil burns easily inside a rotary engine where oil is injected into the engine. Cheaper synthetic oil will burn and leave ash inside the engine which will clog.

gawdodirt

A little knowledge is a dangerous thing.

Full sythetics ARE dino oils. Just reverse engineered. Read up on how they're made and how regular oil is refined.

The processes are interesting.




"Been fighting ignorance since 1960. It's just taken longer than I thought."

GD

gawdodirt

Roger Mandeville recommended regular motor oil 1 oz /gal. I use a good grade synthetic 2-stroke racing oil. Redline. It makes me feel safer.

Lots of mis-information here.

GD

datz

3000 miles or less.

swingdancr

Idemitsu has been making Rotary specific synthetic engine oil for years. That's the only one I'd trust personally.

http://mazdatrix.com/q-supply.htm

bigzman

iTrader: (1)

Idemitsu 1/2 oz to every gallan of gas. I have run in my 91 N/A for many years and also swear by it.
Double post, SORRY.

bigzman

iTrader: (1)

Idemitsu, I have been using it for the last 5 years in my 91N/A and swear by it. 1/2 oz for every gallon of gas you are putting in your car.

ericgrau

iTrader: (1)

Covered in the FAQ. The mechanic's thoughts are 25-30 years out of date, but use high quality synthetics just to be on the safe side. Off the race track the marginal benefits aren't worth the cost if you change your oil every 3,000 miles.

3k oil changes, however, are also 40+ years out of date. No one except the USA even follows it anymore. The manual recommends 7500 and even 5000 is super conservative. There's a forum user who had over 350k miles with 5k conventional oil changes (and, more importantly, all the other maintenance). With some of the better synthetics you can double that. At 3,000 miles the synthetics actually test better (wear, viscosity, anti-corossion life remaining, etc.) than brand new conventional oil. Nobody's engine here ever has trouble from a late oil change, but coolant and other maintenance is a different matter. Ignore the Jiffy Lube marketing; they're making people ignore actual maintenance to prevent actual breakdowns just so they can make a few easy bucks.

Shorter answer: You're gullible so use conventional oil to save money. Or even with the longer oil changes the conventional oil is still plenty.

Black Knight RX7 FC3S

iTrader: (7)

Idemeitsu premix is great. I ordered a 12 quart case from Mazdatrix, I dont drive much between my two fcs (less then 5000 miles combined) the case lasted me about a whole year.
Their oil is great also for rotaries. Their full synthetic oil is formulated for Rotary engines to be burned.