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Hi all this is something that i though i might share and see if people have seen this before. my 98 E36 328i has a little trouble starting when first cold. not i am not here to ask for help on this but to rather share something i have noticed. i usually run it on 98 octane (Australia’s top of the range premium) and last fill up i decided to put in 95 octane and i have noticed that the car starts a little easier when cold. normally i would have to crank it it would cough then die and on second crank it would start easy or i could start it and blip the throttle are it would smooth out. since i have put in the 95 octane i have not needed to give it a second crank it just starts and after 2-3 seconds it smooths out like it would on second start or blip of the throttle. now i have been trouble shooting this for a while and im down to having my mechanic check fuel pressure and flow as-well as do a quick diagnostic check when i take it in next. i have done all the basics and double checked everything. has anyone seen this before that a change in octane allows the car to start or even run a little better. now it appears to start easier but it could be a placebo effect on my behalf. i am familiar with how different octane fuels have different ignition points and that 95 is more potent than 98 . im am interested to hear peoples thoughts on this.
cheers
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