Idemitsu all day. It’s synthetic but what needs to be emphasized is the ingredient blend is purpose designed for a rotary to make the right lube + burn.
I've been running that exact oil in my rx8 for about 1k km now and its still as smooth as ever
I have the 6.4 liter Hemi in my Charger, and I switched from Ultra Platinum to Redline. My car uses 0w 40, but nonetheless, I have not seen or felt any difference between the 2. If you are worried about switching, I can assure you that Redline is a very high quality oil.
I am running Redline 0w-30 during the warmer months. It was the most reasonably priced group 5 ester base (with great reviews) that I could find. Oil temps during my last autoX event were down 15 degrees F, compared to a similar day with the factory recommended 0w-20.
My 07 Passat has 236k. I change oil every 5k, cam follower every 70-100k (20k is serious overkill), lots of coil pack changes (like 4 or 5), and that is about it.
Redline 5w-30 with an OEM filter. No issues and smoother start up.
i am of the mindset of using oil from the region. my GTI is a german car and gets liquimoly, a german oil. my toyota/subaru is Japanese, Idemitsu is a japanese oil (and the oem supplier for Subaru). i have 5w30 in it now.
I've been running Idemitsu oil in the XT and the wife's Crosstrek for the last four and five years and have been happy with it.
You’ll be fine, idemitsu is a bit of a rotary specialist when it comes to fluids
Recently started using in my 2002 M3 and the oil runs cooler compared to the "twin power" oem oil i had been using.
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