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Originally Posted by YANNIS
1st...the car had 400 km or more
2nd... nobody said extended. the oposite. here we dont have such long ways, and the trafic is alway bad. i was able to maintain it for max 5-10 mins, then down to 3500 then slowly back to 3900.
3rd... neither bmw nor dealer have a doubt on that ! manual says no more than 4000 rpm.
4th do you think that going low is better ? as a mechanical engineer I realy think that there is no prob at all. from one side the perfect machining of these engines, the quality of metals and the progress in lube oils will not do any harm at all.
To be honest with you, i dont understand that last 3 lnes ...!
why do you think that bmw gives you 25,000 km for the first oil change???
the times have changed. Let your car breath !!!
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Sounds like this guy is determined to drive in lower gears and higher RPM --3500 to 3900 RPM is way to high for normal driving--Just because the manual limits to 4000 RPM does not mean to cruise at 3900 RPM---put the car in "D" and drive (or 6th gear if manual)--Or just drive as you are and quit complaining about gas mileage.
