So I was topping off my oil as suggested by mazda....and didn't realize I had purchased 5w-30 until after putting the whole quart in....help? Is this ok? Luckily I am going to the dealership tomorrow anyways for some warranty work...should I have them change the oil out of just go the next 1,000 miles?

 

you made a smart mistake
5w30 > 5w20

 

So I'm ok to put the 5w-30 into the 5w-20?

 

yes, and many will suggest ditching 5w20 altogether
i use 5w30, many people use thicker

 

it is not the end of the world.. oil is oil.

i've mixed 10w50 with 5w30.

i wouldn't make a habit of it.. but seriously don't worry about it.

 

Thanks Guys. Why does mazda reccommend 5w-20 if it sucks?

 

to help emissions and to conform to EPA regulations (crappy ones at that) and for a VERY marginal increase in gas mileage.

i live with 5w30 royal purple (syn) all year round

 

5W-20 sucks *****

5W-30 is your friend

 

royal purple 5w30 ftw!

 

synthetic? I thought we weren't supposed to put that in the 8s?

 

k, i think we were being nice, but it's time for you to search
there's plenty of threads on synthetic vs non.. really it comes down to who you believe
if you can think of a question, its probably been answered, so search is your friend.

 

^+1
we don't need any more oil threads

 

sorry guys. will search.

 

i have a thread with this same title...

 

It is the end of the world.

 

 

the sky is falling.

aliens are attacking

we all going to die.

 

i think castrol is the worst thing you can buy after viewing recent tests... plus it just looks so watery. i would use mobil one 5-30, 10-30 or 10-40. depending on where you live.

 

^^^ links to said 'tests' plz.

 

yes, please give us links
i'll give you one for mobil 1
http://www.jobbersworld.com/December%2011,%202008.htm

btw, not knocking on mobil, as i use their 2stroke for premix. just showing "tests" can be misleading

 

Maybe you are right, Castrol is not as good as mobil, I personaly dont know. but from the hours I spent here reading in the Forums, I came to understand Synthetic oil is not good for our RX8. And 5w-20 is too thin from what I read. I also change the oil every 1500 miles... which People think im crazy for, and make fun of me by telling me things like " HEy man, thats not a lambo" . o.. well... Take care of what u have and it all last a lifetime.

 

well, if you spent as much time searching as you say you did, you would have found this link

http://www.royalpurple.com/faqs-rotary.html


enough with this useless thread.

 

Mobil 1 doesn't mix well with fuel so it lubricates the seals less than other oils.
You should search a bit but i think that somebody can remember the thread!

 

In before a potential lock?????????

Just another oil thread!

 

Good thing I use gas w/ my mobil.....So tell me how your deisel rx8 is running? or how its running at all?