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#1
11-25-2011, 09:19 PM
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Preventative maintenance...........
so I'm planning on replacing as much as I need to mechanically and I know that I could replace EVERYTHING I think that's a little extreme. So I'm open to suggestions on what would be good things to replace that could cause a sudden and catastrophic failure of the engine/drivetrain. Things that I can hear coming (Wheel bearings etc) not so concerned about My current list includes Water Pump Thermostat Valve Cover Gaskets All belts 
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#3
11-26-2011, 10:26 AM
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Coolant expansion tank, without exception. Also, have them check the idler and belt tensioner pulleys while the belts are off - bearings start to wear after 100K.
__________________
2021 X3 M40i Glacier Silver 2016 X5 xDrive 35i Mineral Silver Gone but not forgotten 2017 X4 M40i Black Metallic 1985 325e Cosmos Blue 2006 330i Monaco Blue 2006 X5 Ti Ag 2000 528i Ti Ag 1986 535is Black (great ride) 1985 528e Polaris Silver (GTA in NYC)
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#4
11-26-2011, 02:44 PM
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For sure you should replace the water pump, expansion tank, belts, pulleys, thermostat. You should also check the axle boots/seals and the tranny thermostat.
Last edited by capndick4; 11-26-2011 at 02:45 PM. Reason: spelling correction
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#5
11-26-2011, 03:52 PM
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All these mentions of cooling system components, but no mention of hoses. Inspect/change all coolant hoses, particularly if they are soft. And particularly if you are changing pumps and coolant expansion tanks anyway.
What does the oil separator/crankcase ventilation system look like on a 2004 model? If it is like other engine models, I would clean it out, and replace those hoses as well. And flush the brake fluid.
__________________
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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#6
11-26-2011, 04:14 PM
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Have them read any/all OBD codes as well for other simmering problems not apparent.
__________________
2021 X3 M40i Glacier Silver 2016 X5 xDrive 35i Mineral Silver Gone but not forgotten 2017 X4 M40i Black Metallic 1985 325e Cosmos Blue 2006 330i Monaco Blue 2006 X5 Ti Ag 2000 528i Ti Ag 1986 535is Black (great ride) 1985 528e Polaris Silver (GTA in NYC)
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#7
11-26-2011, 06:13 PM
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While you are changing the valve cover gaskets, don't forget about the valley pan gasket!
__________________
 2010 X5M Active Autowerks tune 22" BBS SV in Titanium Gunmetal Black grills
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#8
11-26-2011, 07:01 PM
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Do you know whether spark plugs and fuel filter have been done previously? If not, those would also be on my list. Not that failure would cause the catastrophic failure you mention however.
Congrats on the purchase! 
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2016 GMC Sierra 2500 HD All-Terrain, Duramax 6.6 2011 X5M Alpine White/Sakhir Orange, Eucalyptus, Spare tire!, Comfort, Soft Close, Tech, Rear Climate, Individual dash, Individual Audio, HUD, DVD, USB, Cold. Gone: 2008 4.8i 2005 X5 4.8is 2004 X5 4.4i Sport 2004 X3 3.0i 6MT 2002 M5
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