Quote:
Originally Posted by aerobod
Going back to the original variable oil change interval for BMWs in the E46 and earlier era of fuel injected cars the oil change interval was determined by the number of litres of fuel consumed (I seem to remember it being 2,500 litres for my 323Ci). The harder the car is driven, the higher the fuel consumption, hence the lower the change interval.
They have added other parameters over the years and used oil quality sensors in some models, but I believe fuel consumption is still the main driver of the oil change interval. The projected interval is going to change based on the projected fuel consumption in the recent past being used to estimate the likely remaining interval.
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Hmm. Interesting. Would it be reasonable to assume then that city driving in sport/sport+/traction simply for the purpose of listening to wonderful burbles might inadvertently shorten the intervals?
I have been wondering if my tendency to drive in these modes in start/stop traffic may be the cause, but couldn't wrap my head around how this would affect oil change interval. Based on your info, I'd guess that the unburned fuel being dumped into the exhaust to cause the burbles may be dramatically affecting fuel consumption and therefore intervals? I don't track fuel consumption, so really can't say how many mpg I'm getting...