You are right about that. The 3 series is the most reliable BMW made. Partly because it gets technology after its been tested in the 7 and 5 series. But also because BMW sells alot of 3 series and wants to keep those buyers happy. I think like 45% of all of BMW sales are 3 series models.

Also a series and its price bracket have many more competitors than say a 760. So they have to keep an owner of a 3 series happier or they will just go buy a lexus or infinito or the tons of other cars in that class. But some one that buys a 7 Series doesnt even have a third of those choice. Basically its a 7series and Sclass or an A8. thats it there is nothing else to choose from

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Dinan M3

2006 X5 4.4i Sport Current Vehicle
2006 CLS 55 AMG Current Vehicle
2010 FORD F-450 King Ranch Current Vehicle
2012 GL 550 Current Vehicle

1999 M3 Dinan S3 SOLD
2001 M3 Dinan S2 SOLD
2002 M5 SOLD
2004 X5 4.4i sport SOLD
2007 335 XI Lease ended
2009 E92 M3 SOLD