At a time I was doing 25-30k a year mostly in my S80 I went Optimax (now V-power every time) or BP Ultimate. I would notice a difference in performance and MPG if I used cheap supermarket fuel, infact near the end of it's life the S80 had an unsolvable limp mode issue if you hit 2500rpm with any kind of gusto. What was relevant though was when running on Optimax it hardly happened. I never knew why. Tank of so called lesser quality fuel it would occur several times a journey.
|