IMO the 3.0 will be cheaper to maintain. And with a sig line like "M54 lover" there probably shouldn't be any debate.
Some pictures for you from other threads:
Krunk Man towing 6500 lbs of boat with his 3.0
X5Hogtown pulling 3200 lbs of M coupe and 2200 lbs of trailer with a 3.0 5 spd
withidl, our favourite tow expert, pulling 8300 lbs with a 2001 4.4 (over tens of thousands of miles)
Worth searching on these and other posters for other substantial tows. Lots of good experiences. As mentioned before, I have towed 5000 lbs with a 3.0 Steptronic, and it did fine.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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