Even better than the first set. If you don't take our advice and buy the 8 anyway, we can't cut you out of the will.

Ken

 

I agree. They have a reason for printing 5w-20 on the cap. A team of experts did that. Not just one person who thought they had a great idea.

 

Why did they put heavier oil in other countries? I think they recommend either 5W30 or 10W30 for the japanese market.

 

Good question and a pretty annoying one too. Nobody wants to put potentially harmful oil in their engine. Why cant something be written in stone.

 

I believe the reason they went with lighter oil was because of emissions, but I could be wrong about that. Point is... 5W30 and 10W30 probably aren't going to hurt, especially in the warmer climates.

 

I believe if you check the manual, it will have a graphic of grades and temps.

Hm, just checked. All the standard words about temp and viscosity, but the graphic only has 5-20 on it... You are supposed to check from a list of one.

Glad that is cleared up. Stupid book...

 

That's the US manual. Elsewhere the manual has a bunch of different grades. The page from the Australian manual has been posted here several times.

In temperate climates (say 0 F to 100 F) there are a lot of acceptable grades. I think that nearly everyone's "Mazda is wrong - this is what I use" weight is OK. 5w20 is the thinnest of the bunch. In the US they recommend 5w20 because it gives a slight edge on fuel mileage. Every US maker pushes as hard as they can to meet CAFE requirements.

Can we get back to arguing about synthetic vs dino, instead of which weight?

Ken

 

i've been using 10w40 royal purple synthetic since 07 with no problems car has 88k miles on it and still running strong

 

YAY!! Another oil debate.

There is no proof that ANY oil, synthetic or conventional, is better than the other.

Everyone barks about temps, thickness, this and that.

I still have yet to hear of an oil that is PROVEN to help the Renesis last longer through data gathered by a mass amount of Rx8s running that weight.

Its all opinions and here say.

Soo, why argue about it

 

Want to go crazy? Look to the forums for answers to questions already answered by engineers.

 

Or just use the recommended oil and dont worry about it if you dont have prior rotary experience.....

 

Are you using the argument that some engineers at mazda decided we should use 5W20 therefore we should trust that and stick with it?

 

Playing devils advocate, how many members of this forum have the same credentials as the engineers

Especially when you're running the risk of causing warranty issues, etc.

Just my .02. Not meant to be an arguement starter.

 

No one here has the resources of Mazda. However, many of use do have many years of rotary experience. Combined, that creates a huge knowledge base. Also, Mazda engineers have to weigh both the vehicle performance and longevity with government compliance requirements ( emissions & mileage ). The government requirements are something that we can partially ignore.

 

Its a matter of someones opinion. It does depend also about climate and time of year but I guess I will be dumb and go with whats stamped on the oil cap.

 

^+1

 

Worked for me for 83K and counting. And when it blows within the next 17K miles, Im still covered under warranty

 

Went to Pettitracing and bought some Protec R to mix with my gas. I was reading up on the RX8 facts area and they made some good points as far as oil. I am not saying they are completely right but they made sense to me. I will keep using the specified oil on the cap but will protect it with the premix. I bought 36oz w/shipping for less than $30.00. You use 4 oz for each tank of gas. Know one will ever win the battle of oil topic in the nearby future so just go with your gut feeling. Its more important to protect your engine than worry about others engines.