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I know this topic might have been covered before, try searching but cant find exactly what im after,

as you can see from the topic its about different brands of fuels,

I just purchased my R33 skyline not long ago, i noticed it runs quite horrible on Vortex98 fuel for some reason, that fuel isnt cheap either,

Ive filled it up with optimax and noticed immediately a big improvement, car now idles very smooth and more torque,

Is caltex fuel not up to par with Shell fuel? when i purchased the car originally it was running normal shell ULP, the car ran better with that than the vortex98 stuff,

could it possibly a bad batch,

what is everyones opinion on vortex98 and optimax?

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https://www.sau.com.au/forums/topic/104981-different-brands-of-fuel/
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Yeh im having the same problem with my s15. If i put normal caltex unleaded it runs very smooth but if i use vortex 98. some how it idles weird plus performance is not that great. some people has told me that it has something to do with the maf sensor. I tried cleaning it and it worked for a while.

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