It's all psychological sometimes :]

If you think it's good.. it's good..

However, i've always had the worst experience with Mobil 98, in every vehicle i've driven so far, tho the normal unleaded Mobil stuff works fine.

Maybe it's just all in my head.

Never had issues with BP Ultimate and it always runs well. I only stick to Shell, Caltex and BP.

I use Shell more because it's around where I work, live and drive around. However, same with the Caltex stations. BP i've found difficult to locate in certain areas.