Hello,

I just bought a 1993 RX7. It is bone stock and I intend to keep it that way. The dealer changed the oil before I bought it with conventional Castrol 10w-40. Is this an OK oil to use? I just dont know what kind of oil (brand or weight) is a good oil that is commonly used with a stock third generation rx7. Can someone fill me in on what people around here would use in my situation? I am coming from the WRX world where it is common to use a synthetic 5W-40 but I just dont know what kind of oil for my new RX7. My manual says no synthetic and only talks about 5w-30 and 10w-30?

Thanks,
Drew

 

Idemitsu synthetic is made specifically to be burnt in a rotary. Most synthetics leave residue that is not good for the plugs and seals of a rotary when burnt (omp injection).

Maybe some one else can guide you better, or just search. Tons of threads on oil.

 

10w-30 and mix your regular gas with 2 stroke engine oil and you should be fine.the 2 stroke keeps the rotors lubricated

 

I use 20-50 in the summer and 10-30 in the winter. Castrol GTX always, I never put synthetic oil in my RX-7.
Not that synthetic is bad or anything, I just change my oil regularly and see no reason to spend twice as much money.

 

+1

but 10W-40 or 15W40 aren't bad alternatives for lower mile engines in summer.

 

No one has ever discussed what kind of oil to use in a rotary.

Thanks for starting this thread!

 

I have actually not had much luck looking. Could you tell me which subsection to search in?

 

Searioualy? Use the search feature on this forum. If you search for all threads with the words "synthetic oil" in the title, there is 147 threads. Hmmmm...

 

I use 10W-40 Castrol GTX.

 

There is a search area that you can search fouroms so search there and see if u can find anything

 

I use Prolong rotary engine formula in my FD and RX8

 

Why does the mileage of the engine matter? Just curious as to why you mentioned it in relation to your oil choice.

I also use 20w50 castrol GTX.

 

yepp 10w30 in the summer , and what ever brand is on sale that week!!!

 

As the original owner of my ‘87 RX-7, I’ve only ever used 10W-30. But I am living in Canada and it is only driven in the summer.