+1 to upallnight. The E53 is a great car, but it seems almost every new owner on the board (myself included, twice) starts with transmission slip issues. If you can do the work it's a great ride. If not, consider that I spent almost $10k on just the transmission at a reputable but moderately priced indy.

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2010 E93 M3 - Le Mans Blue
2010 E70 X5M - Alpine White
2016 F15 40e - Imperial Blue