Yeah , I think I'll stick with Mazda.

I used the ones from rotaryaviation...perfect fit and supposedly better than oem mazda...check them out at www.rotaryaviation.com

ideally though, would pure vitron, or what mazda used be better?

I have to disagree with you guys that say use only mazda oem. Mazda makes a lot of good quality parts, but sometimes there are better and cheaper alternatives. Like viton over rubber for example. I just don't like to pay more than I have to for rebuild parts, especially if there's something better available.

Fc3S.org went out on a limb an ordered a ****-load of the Correct sized viton O-rings from an unnamed source. I will have the Correct Sized inner coolant O-ring in a few weeks. https://www.nopistons.com/forums/pub...IR#>/smile.png

I absolutely agree, jay'. I do this myself on some of my rebuilds; I tend to look for alternatives over Mazda. I've found some, also. As well as viton, I don't agree with using it for an oil control ring, especially the outer, because of the temperature parts of the rotor get to -> we're talking near 500F degrees. Viton is good for -10F to 400F from what I remember; a teflon-encapsulated silicone o-ring is better here in my opinion.



B

Mazdas green inner and green outer oil seals. Do not use Mazdas outer (black colored) oil seal. green on green is what I started using lately. I have had some failures with mazdas black outer oil seal. Black outer oil seal is of a softer material then the green inner ones.

Do the green and black oil seals have different part numbers?

yes

O-RING - OIL SEAL OUTER 0820-11-341 4 Green

O-RING - OIL SEAL INNER 1202-11-343 4 Green



- do not use 8341-11-343 black o-rings.



From MAZDACOMP

Sweet. Thanks!