I was reading online, and it said that synthetic oil shouldn't be used in a rotary motor.

But then other people say that certain types of synthetic oil is okay, and in some cases, better to be used.

Sorry, I'm learning, but I don't know this and so I figured I would ask, and maybe someone would be able to help me.

Thanks,

Shaina

 

Higher quality synthetics are fine to use.

 

i ran royal purple for years without any problems but it just cost to much $$

 

IBTL

Name-brand mineral motor oils are perfectly fine.

Synths just cost more and give you miniscule gains in power and gas mileage.
If you feel like paying 3x the cost for oil changes just to gain the 1-2hp increase, then it's your money.

Synths do have the reputation of "causing" more oil leaks, so old vehicles like ours can start to leak like a sieve...be prepared.


-Ted

 

you should learn to search

 

I use Royal Purple 20w-50.. but it costs 13.00 a quart. Castrol 20w-50 will work just about the same but for 3.00 a quart.

 

Covered in the FAQ:
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/frequently-asked-questions-2nd-generation-rx-7-faq-fc-494667/

We also have a good Search tool on this forum:
https://www.rx7club.com/search.php

 

Okay, thanks.

 

Yay, another oil topic. Ignoring the obvious advice of checking the owners manual, factory service manual, FAQ or the chart under the hood, a simple search would have turned up all this information.

Here's a search for "oil type":
https://www.rx7club.com/forum/showthread.php?t=766718
https://www.rx7club.com/forum/showthread.php?t=751369
https://www.rx7club.com/forum/showthread.php?t=742515
https://www.rx7club.com/forum/showthread.php?t=734289
https://www.rx7club.com/forum/showthread.php?t=731647
https://www.rx7club.com/forum/showthread.php?t=707168

That's in the first two pages. I ran another search for "recommended oil" and got all this:
https://www.rx7club.com/forum/showthread.php?t=746184
https://www.rx7club.com/forum/showthread.php?t=695594
https://www.rx7club.com/forum/showthread.php?t=620140
https://www.rx7club.com/forum/showthread.php?t=686293
https://www.rx7club.com/forum/showthread.php?t=665278
https://www.rx7club.com/forum/showthread.php?t=647462
https://www.rx7club.com/forum/showthread.php?t=629858
https://www.rx7club.com/forum/showthread.php?t=597559
https://www.rx7club.com/forum/showthread.php?t=576484
https://www.rx7club.com/forum/showthread.php?t=573591
https://www.rx7club.com/forum/showthread.php?t=373897
https://www.rx7club.com/forum/showthread.php?t=523699
https://www.rx7club.com/forum/showthread.php?t=513467

And I stopped after page three.

Just for the record, the Factory Service Manual can be found in the FAQ For FC thread. It contains all this information and more, and is an essential tool for any sort of service work that needs to be performed on these cars.

Additionally, the Haynes service manual for the 1986 thru 1991 RX-7 (both turbo and NA) can be found at most local auto parts stores or purchased from any good bookstore (ISBN number 1 56392 007 7). It is only about $25 and is a great quick reference for things like this. Not only does it contain most of the information in the FSM condensed into an easy to read format, but it includes full wiring diagrams as well.

These manuals will answer 99% of service related questions for the car and if you intend to do your own repair work, you will need at least one of them. Preferably both, since the FSM is a free download.

Now, closing thread.