I am shopping for a Mazda RX-8 but reading a lot of horror stories about the rotary engine:
- never use synthetic oil
- buy lots of oil because the engine consumes a quart every 1000-2000 miles
- the seals often "blow out" and need replaced
Anybody have recommendations on what proper Oil to use in this finicky engine? The manual says 5w-20 but I'm thinking a thick 5w-40 might be better to reduce consumption? (Not Mobil 1 as it's synthetic.)
A buddy of mine had one about 8 years ago and he reported nothing unusual except for the extra oil that the rotary consumed about one per month he had to put in a quart. I don't beleive he used any synthetic oil of any type.
He also didn't say anything about the seals blowing out nor needed replacing.
If I were you I'd just use a 5w-20 like the manual says and not the 40w cuz the rotary consumes oil like normal. It's the nature of the beast.
When you finally decide I'd consider another engine/car cuz I think after 2014 I believe Mazda isn't going to make any rotaries anymore but instead of concentrating on the "Sky Active" engine technology.