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'm a Castrol syntec guy and I like Kirkland oil. So that's what my cars get.
I'm personally running Castrol in the BMW bottle.
Got some numbers for the oil pressure Water temp around 90-95C/194F. Ambient temp 28C/82F Oil 5W30 Castrol Edge LL Hot idle 20 PSI 2000RPM 60 PSI 3-5000RPM 70 PSI Looks okay?
My co workers wife had a high mileage Sienna 3.0. Oil leaking from every seal. We started using Castrol high mileage, it stopped leaving spots in his driveway and quit loosing 1.5 qrts between oil changes.
I have stuck with manufacturers till manufacturers recommendation is causing issue, like my gixxer leaked entire oil from companies estar engine oil, switched to castrol power 1, no leak, headache gone and happy riding on it for about a decade now.
Castrol/Mobil1 5W-40. On my JK I change it every 7000 kilometres MAX
I ran Castrol 5W30 full synthetic in the engine.It burned a quart every 3500-4000.
I noticed when the castrol 508 spec wears. It smells Faintly of onions and beans. Strange smell indeed, when I took my car to street side VW out of Amarillo, Texas.
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