- Joined
- Jul 31, 2020
- Messages
- 5
I switched over to premium fuel (BP Ultimate Unleaded, 98 octane) from regular unleaded (91 octane), initially I saw no difference, but after about 2 days the performance increase was impressive, I'd say a 30% improvement in acceleration (from a stop) and the fuel economy has been 25% better (20L/100km to 15L/100km as measured real time in the BMW dash).
After about 2/3 weeks now the performance is still excellent, but I've noticed the exhaust smell is really bad. It doesn't smell like normal exhaust emissions, that sulphur smell of carbon and Co2, it now smells like harsh chemicals, a really eye-watering noxious radio-active chemical smell. You cant smell it for more than half a breath or you feel like you're going to choke or vomit. I cant even be near the car when its idling in the morning, it just smells so bad. Its only the smell, its not smoking more or at all, apart from a brief steam in the morning. Is this smell normal? I put liqui-moly "tappet stop noise" in the oil about a month ago too as the lifters are noisy at times, but this smell seemed to appear only after I switched fuel.
Thanks for any input, the experts on here might be able to shed some light on this.
After about 2/3 weeks now the performance is still excellent, but I've noticed the exhaust smell is really bad. It doesn't smell like normal exhaust emissions, that sulphur smell of carbon and Co2, it now smells like harsh chemicals, a really eye-watering noxious radio-active chemical smell. You cant smell it for more than half a breath or you feel like you're going to choke or vomit. I cant even be near the car when its idling in the morning, it just smells so bad. Its only the smell, its not smoking more or at all, apart from a brief steam in the morning. Is this smell normal? I put liqui-moly "tappet stop noise" in the oil about a month ago too as the lifters are noisy at times, but this smell seemed to appear only after I switched fuel.
Thanks for any input, the experts on here might be able to shed some light on this.