Castrol here.5W20. Keep it within 1/2 of full to full most of the time.

 

The oil is injected really slowly (drooled?) into the top of the rotor housing, in two spots, one for each side of the rotor.

It doesn't mix with the gas, just slimes the tip of the 'apex seals'.
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doc

 

Using castrol oil since I got the 10 year 300,000 mile warranty from my dealer if I use castrol oil and cange every 4000 miles.
ers

 

Remember, we're talking about a very slow flow. If you're only using a quart ever 2000 miles, it would be like an IV bag in slow motion. Just enough to keep an oil film established between the seals and housing.

 

mazda oil is avalible at a very steep price $107 for 4 litres

http://www.corksport.com/main.php3?p...3Fcat%3D214910

just for you guys wondering.and don't try to find it at your local dealer
I had mine changed at 700 miles just to get the muddy water oil slime out and have it documented for future warrenty work if it comes to it .and they put in 5-30w mobil in it.again a dealer doing a bad job.not even using the right oil in thier own cars...pitiful isn't it.........oh well I am serously thinking of going to synthetic anyway.I have worked at refineries and car oil is one of the lowest grades oil they make.......truth

 

Thank God none of you guys said you use Valvoline. Why would anyone use an oil in a rotary that is named after valves!!!

For standard oils I recommend either Havoline or Castrol. That's it. These 2 oils are actually very close to each others formulations. They lack alot of redundant additives that the other oils have that can lead to deposits. More additives aren't necessarily a good thing. I actually like Amsoil and Royal Purple the best.

I have used pure synthetics in older rotaries for years with no issues. Mazda used synthetic in the 787B LeMans car. I have never had an issue with them. Here is alot of useful info I posted in the past about synthetic oils as well as oil weight ratings.

https://www.rx8club.com/showthread.p...synthetic+oils

https://www.rx8club.com/showthread.p...synthetic+oils

 

For your info, the Mazda Rotary oil sold in Australia is packaged in Castrol containers.....

Mazda have made it plain, you can use synthetic in a Renesis, however, Quote: Mineral oils are more suitable. End Quote.

Read that to mean you will get better longevity with a mineral oil.
The Mazda oil retails at AUD$55 for five litres....

Gomez.

 

Gomez, thanks for the info on synthetics and mineral oils. I may have to mail order Royal Purple for my next oil change. I haven't seen that brand at the stores around here, only as a TV commercial on "Car and Driver".

 

Omg!!!!!!!! I did used Valvoline.... at the first bottle.... but I am using Castrol now... God... why would it happened to me..... so sad......!!!!!!!! tearingr me to parts.

 

Other than the name, is there a reason not to use Valvoline?

 

I usually buy whatever is available at Walmart or Canadian tire.
API SL ILSAC GF 3 5w20, any brand.

 

Mobil 1 0w20

It's a little pricey at $6.46 a quart but I swear by it.

 

I used Valvoline because it was the only 5W20 I could find at my local Auto Barn, and I was low on oil. I didn't want to drive all over the place low on oil to find whatever boutique oil is in style. It said specifically it meets Ford and Mazda specs on the back of the container. It says nowhere on the bottle that it's synthetic.

I'd worry about anyone telling you not to use an oil because they find a non-rotary word somewhere in the brand name. That's just silly. "My car blew up at 50,000 miles and I used Valvoline" - that's what you should look for.

 

Anytime...

 

I was being sarcastic. I'm just waiting for Rotaroline to come out.

 

Most of that is certification, and both Penzoil and Castrol should have the required certification, so just look for 5w-20 from either of them.