Originally Posted by dirtyylicous
There both good oil. I used royal purple in my lexus and i acuatally felt a tiny boost. Also mpgs were better.
But i read on here some where bmw says only to use bmw and mobil 1 or something like that. Royal purple is also $$$$. Just stick with mobil 1.
Unless something has changed, Toyota Motor wrote a long article mentioning the lack of benefit to using synthetic motor oil, when dino juice is changed according to the factory recommended intervals. If it doesn't come with it, no need to use it. Our BMWs say to only use it, so we should do just that. I kind of doubt better mpgs show up as a result of using synth.