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Old 12-06-2012, 10:27 AM
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645/333 645/333 is offline
Location: uk
Join Date: Jun 2010
Posts: 1,632
Mein Auto: BMW 640i SE Convertible
Originally Posted by Hassann View Post
WOW thank you all for the warm welcome!

The car idles perfectly fine, no juddering or fluctuation of revs when he car is standing still. The vibration only happens when I'm creeping forward in traffic without any gas being applied. This problem is intermittent, only happens sometimes. I think I've noticed a pattern, it seems to happen when the car is warm (ie come of the motorway). The vibration is very noticeable, but only happens when you creep forward - Hope that makes sense!

I also notice sometimes when coming to a stop, when the car downshifts to 1st/2nd, the downshift feels rough/harsh causing the car to leap a bit (engine brake)? Is this normal?

I've read through a few threads about gearbox oil changes etc. I've read that if the car has exceeded 60k miles (mine is currently on 84k miles) it is not recommended to change the oil as it may result in harming the gearbox rather than doing it good as the oil has debris in there which helps protect worn components within the gearbox.

With regards to the MPG, I drive in rush hour traffic through the city for 10 miles and 10 miles on the motorway. I average 22mpg. On the same journey at the same time in my Nissan 350z I was getting a return of 23-24mpg. Considering the 6 is a convertible (heavier), bigger engine and an automatic; can't complain with the return!

According to my service history record book (my current mileage is 84k), the spark plugs were changed at 64k on 13/08/2009. The iDrive is showing the spark plugs have 44k miles remaining and it has been driven for 20k miles/3 years since they were changed. Does that tally up? How often do spark plugs need to be changed? These spark plugs were replaced at a Mercedes Specialist and not at BMW - would you think there is a possibility they replaced the spark plugs with the wrong ones?

Everything on my iDrive is showing 'OK'. Can the seller 'fiddle' with it to show 'OK' when it really isn't?

Photos are below:

Nice car and colour! With respect to the spark plugs the IDrive normally say's 60-70k, so that fits, the plugs are not standard plugs on these cars so it is worth a punt to have them checked and maybe replaced with the right ones, consider going to an independent BMW specialist with the correct equipment to read the error codes, this should also give you peace of mind for a nominal fee, at least you know.
You cannot mess around with anything to do with the IDrive hence my point to see an independent.
I would consider changing the transmission fluid, read the threads on here!!! You can only replace about 6 liters without a complete drain(which is very difficult even for a garage because of the torque converter). Be aware you can only use a very special oil in the auto-transmission, BMW sell it and yes it is 30 per ltr, but do not be fooled into using anything else, that will destroy the transmission. A transmission repair will be more than your car is actually worth, no debate!!
Good point to do a transmission reset just follow the guides lines (you can do it as often as you like, sometimes clears minor errors which do not come back).
Yes you will read lots about the car's issues, that is why forum's are here and this being the best of the best, but believe me you will never own a better car, I miss mine!!!

Always said I would go back to a 6 series
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