Redline 10w30 full synthetic if I know I'm going to beat the piss out of it for the next 5k miles (think autocross or mountain runs), otherwise I use Honda 10w30 full synthetic.
I do not use auto oil. Motorcycles run hotter and I don’t trust car oil. I use Red Line. They sell a V-Twin kit that has engine oil primary oil and transmission oil, and fuel system cleaner. I buy one each spring.
Redline 5w30, the best
I think Idemitsu is the better option if you have access to it. Mostly because it was developed for the rotary engine.
If you can use Redline 5w30, go right ahead. You will not have an issue. I call Redline the guarantee oil. I can pretty much guarantee that you will never have the dreaded lifter tick. It has been known to quieten a ticking engine too.
It's recommended by Nissan to use ester based oil. I use redline 5w-30. Pricey but I feel the difference and motor runs flawless imo
Using Redline 5w-50 on my E90 M3. it's supposed to have a similar viscosity at high temps as most 60wt oils. Comes up to operating temp faster and doesn't overheat.
I also switched to a 50 weight, Redline.
I was seeing moderate oil consumption and the heavier viscosity seems to have fixed that issue
The best oil to use is the RedLine full synthetic two-stroke Racing oil. Modern full synthetic two stroke oils are way better than older oils and work great.
Idemitsu to both, because it’s designed and tested on rotaries.
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