Hi. This is my 1st visit and so I'm not sure where to go!
I have just upgraded my PZ to a R3. My old car used 5/30w oil but according to my local oil store, the R3 uses a different one. Anybody got any concrete info?? Im confused to say the least

 

5/30 is fine.

Take a auto shop class.

 

There is a wealth of oil information and research regarding the RX8. I'd review those posts and then make up your own mind.

5/30 of your favorite brand/type is perfectly fine. Others will tell you different but it comes down to who you trust and what information you find valuable.

 

5W-20 is "recommended" [not required] by Mazda (mostly to bolster fleet fuel use averages), but most 'round here go with 5W-30, or heavier in hotter climates. I like Castrol GTX, but there are a number of high quality oils.

And before you further ask... Mazda recommends fossil rather than synthetic oil because they ~"haven't accumulated the long term data necessary to recommend synthetic." At least that's what my 2005 Product Update DVD narrator said. But then it's now 2010, so .....