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My 08 3.0l Loved throwing a CEL from 120k to 155K where it was involved in a Head on collision and put out to pasture ($11K in damages RIP). Always threw codes for the exhaust vanos, especially with the AC on and spirited driving. I cleaned and swapped the cylinders and always got the code on the exhaust vanos. My whole time owning that truck the engine never seemed right. It idled a little rough for my liking and didnt seem very spirited. It just went. (80k miles of ownership) There were no vacuum leaks (smoke tested) and everything under the hood was within specs according to the stealership and my indy. I just never could go full throttle with the AC on because it would kick that CEL and seem bogged down. After a lot of time and headaches replacing vacuum hoses, maf sensor, filters, plugs, valve cover for a new PCV and a bunch of other odds and ends I just said piss on it and drove the truck with my Carly dongle in and cleared the CEL whenever the light came on.
I will say that the CEL came on more often in the spring and summer months rather then the winter months.
Fast Forward
My 2010 3.0l is perfect. Idles smooth as silk. The engine is responsive and doesnt seem bogged down ever. Even my husband with his M2 said....wow this feels so much better then your last one (which led into the used car lecture) AC on or not. I have driven other 08's and it was touch and go. Mileage didnt matter....2 felt bogged and 2 felt like my 2010.
I'd love to know what you find because my 2010 is getting up there in mileage (110K) and I don't know what the future will bring. My goal is to keep it until it literally blows up.
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2010 X5 3.0 X-drive Titanium Silver/Black
2018 Ford F-150 Platinum Crew
2010 528xi (His)
2017 M2 Manual (His)
Former Headaches:
2008 X5 RIP
2015 M235
2013 135is
2009 535xi Wagon (JUNK) 
2007 530xi 6spd CPO Sport (Best Damn Car EVER)
2011 335xi M-sport Coupe 6spd (Sex on Wheels)
2010 550GT "CPO" (Junk) 
2012 X5 35d "CPO" (More Junk) 
2004 330i ZHP Sedan
2002 325xi Wagon
2000 323i Sedan
1998 M3 Sedan
1992 325i Sedan
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