I drive a 91na and I was wondering what kind of oil is best for my rx. I tryed to search but somethings messed up with my comp or whatever. But I just wanted to know what oil I should use. Please reply, I need to change it today

 

https://www.rx7club.com/forum/showth...threadid=42080

https://www.rx7club.com/forum/showth...hreadid=167027

https://www.rx7club.com/forum/showth...threadid=41367

https://www.rx7club.com/forum/showth...hreadid=125870

https://www.rx7club.com/forum/showth...hreadid=106016

 

my personal favorite is castrol gtx 10w40 non synthetic. rotaries burn oil to help lube the engine and synthetic doesn't burn well. hope this helps

 

haha you owned him..

depends on your area

if its summertime and hot where you are, you should run 20w50 or so..

 

i hear running 20w50 on an na is a little much .they say to use it on turbo cars but on na's you really only need a good 10w

 

i use castrol gtx 10w40 non synthetic also!!

 

CASTROL GTX 10W 40 @ WALMART 5 QRT CONTAINER $4.95

 

the manual says: any rotary that doesnt see below -17c (0 F) should be running 20w50

 

As covered in countless threads:

Avoid conventional 10W40 and 10W50 oils in high reving modern engines.

Both have way too high polymar additive packages, that will cause build up and increased ash in rotary engines. Many manufactures will void warrenties when 10W40 or 10W50 is used in modern engines.

See the problem is that to get that viscosity range you have to use a way low base stock and dump in additive and additive until the oil will work like a 40W or 50W when warm.

Again as covered over and over (and over):

Use 20W50 or 15W50 in temps above 20F
Use 10W30 in temps between -10F and 80F
Use 5W30 in temps below 0F.

Improper weights at the above listed temp ranges can result in too thin sheer walls on the metal surfaces and engine damage. Conversly using too thick oil (such as a 20W50 in sub 10F temps) will result in improper flow and increased wear.

Here is a very well know report on oil and why not to use 10W40 or 10W50 (or even 5W30) in modern high reving engines:

http://www.vtr.org/maintain/oil-overview.html

 

if you look in your fsm, it says what weights of oil you should use for what situation, kind of like what icemark said, but in a linear graph type of deal, easier to compare circumstances and when they overlap