Every car nut guy always has dreams of owning and driving the most exotic cars in the world, and then you have guys that simply are content driving whatever as long as it has 4 wheels. In the past several months I have avidly been looking into purchasing a 6 series BMW. There have been several 6 series that have come into Haus of Minis & BMW and the owners have been thrilled thus far with their purchase or simply want to get rid of it as quickly as possible.
After a lot of research on later model 6 series BMW’s we have come to the conclusion that purchasing a slightly newer 650i with an extended warranty is your best option. Reading quite a few articles on 2005-2007 645c and 650i there seems to be a few common issues with these vehicles. The problem areas on these vehicles can include replacing the timing cover gasket. This is a costly repair item due to the fact that there are three timing cover gaskets, one of which requires the engine to be removed in order to change.
The battery and alternator seem to be chronic issue as the vehicles electric system requires the battery and alternator to be in mint condition otherwise it can/will eventually create random error codes.
There is also the infamous alternator bracket oil leak. For some strange reason BMW thought is was a good idea to put a hole in the engine (for no reason) that literally requires a $5.00 gasket, but requires about 8-10 hours labor to replace due to the amount of components that need to be removed to access the gasket. If you purchased a 2004-2009 BMW with an 8 cylinder engine and just found out the dealership wants between $1800-$2200 to change this gasket you would not be very happy! This along with the valve stem seals (oil smoke) and carbon build up issue is part of the reason that a car that sold for nearly $100,000.00 a few years ago can now be purchased for under $20,000.00
Another common issue in the 6 series and almost every model V8 BMW is the expanding coolant pipe that is known to leak severely. This problem is very common on high mileage vehicles between 75,000 and 100,000 miles. There are aftermarket replacements that are made of different material than the stock part, which guarantees the repair will last longer than the original.
The 6 series vehicles that we have come across at Haus of Minis & BMW have either been problematic or no problems at all. These cars are hit or miss, you either got a good one or a bad one.
Other than the poor gas mileage and the constant buying of rear tires, these can still be enjoyable cars to own, but please get your future 6 series inspected by a certified BMW technician before committing to this beautiful vehicle.