I have been told that you cannot use synthetic oil in the rx8, that only conventional oil should be used. Is this true, and if so why?

 

Please learn to use the Search function of this forum...this has been beaten to death already

 

hahahaha dannobre is right.. basically mazda doesn't know the long term effects of using synthetic oil on the 8.... So they aren't sure if the synthetic oil will damage the engine... But I personally recommend using Non-Synthetic 5w-20 Castrol GTX..... but do the search and see what you think... basically it comes down to what you want.........

 

if you get rid of the stock oil injectors and add premix to the fuel, then yes you can use synthetic for sure. This has been documented on rx7club too I'm certain, basically it has to do with oil injection system being the primary concern as I recall.

 

Do search...Zoom44 got it right from the horses mouth so to speak at 7stock8



OOPS...sorry RG misquoted again

 

+1

 

I could have sworn that was RG at the 7stock....

 

I was right, post #16 https://www.rx8club.com/series-i-tech-garage-22/synthetic-oil-another-one-73807/

 

thanks for the replies, i'm new to the site, but will defintely check out the SEARCH

 

Here's a good place to start. RG's Oil Blog

 

Yep, it was RotaryGod at 7S8, I bore witness to the discussion. He has an incredibly lengthy post on this topic and very good explanations in the tech section. Feel free to use the search button if you cannot find it on your own.

 

I really wish I knew about the Castrol Syntec solvency in fuel so I could crack into my stock of the Green oil...

So far we only really have ok'd the Valvoline and Royal Purple brands, and nixxed the Mobil1

 

Shouldn't be too hard to find.

 

lol, I totally missed your post. must be the wine

 

hahaha I just had to give ya a rough time lol. Have one for me!

 

so what makes you come here. never seen this ? before, my advice to you being that your here 24/7 DONT CLICK ON THE THREAD this guy will figure out the search button. i get so pissed when people chime in just to say search first when they have nothing to add to the thread

 

 

You have even less to add...yours was a personal attack against me........mine was at least useful information. So to follow in your footsteps........BITE ME

 

yeah what he said

 

 

Really are you stupid why would you use 5w 20 hell every 8 not in america uses 5w30 cuz america tried to be better on enviroment and gas mileage which dont think helped gas any. unless youre under warranty which doubt you are now or just got good oil for ridiculously cheap id not use 5w20 if anything lightest oil id use is 5w 30 but most people use 10w 30 or 10w40 on rx8s from everyone ive spoke to and read about i personally use 5w30 or 10w30 depending on time of year

 

So you call another person stupid while replying on a 13 year old thread, with the spelling of a toddler...

Ok then.