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#1
11-22-2018, 12:49 PM
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Radiator
Quick question, How weak is the radiator on the 4.8IS? Can all other cooling parts be replaced and not the radiator without failure down the road?
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2005 4.8is. Blue ext, white int. 
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#2
11-22-2018, 01:20 PM
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I'm not aware of an MTBF that would necessitate a preemptive replacement. It's a pretty easy job if it eventually fails.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#3
11-22-2018, 02:13 PM
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As far as I know they're pretty strong as I also have 2005 4.8iS that has had zero cooling issues and I regularly drive with air temperatures in excess of 135f in the shade. But mine has the "gulf" package so that may be different.
Sent from my SM-A730F using Tapatalk
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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course
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#4
11-23-2018, 01:38 PM
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I say they last about 100k miles in North East climate. Mine started dripping at one point, swapped it out in like 30 min.
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2006 4.8is, Black on White. SOLD Sniff Sniff. 2017 F85 x5m, Black on Red. BEAST MODE "The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain Unlock OBC post 5
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#5
11-23-2018, 02:43 PM
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I would say radiator is not really a weak spot. Probably will eventually start leaking very slowly(as was mentioned) at the gaskets for the end tanks as they shrink a bit giving lots of warning.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me)
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#6
11-23-2018, 02:46 PM
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I'm at 170k; mine gets replaced tomorrow, along with the trans cooler, thermostat, bracket and a bunch of hoses.
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12 E70 3.5i xDrive 03 E46 330i ZHP 01 E53 3.0i 98 E36 323is 12 Audi A4 Quattro 79 Triumph Spitfire 73 MGB
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#7
11-23-2018, 07:34 PM
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Unlike the E39, I’ve never heard this part to be a weak spot, that is why I’m asking. But I guess the smart thing to do is to replace it anyway since I’ll be in there. I’m just over 100k.
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2005 4.8is. Blue ext, white int.
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#8
11-23-2018, 07:42 PM
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My original radiator was replaced at 186k miles recently, still working fine. Only thing not perfect about it was that the nipple for the upper radiator hose was a little crumbly. No leaks at all. 2001 3.0i.
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2001 X5 3.0i, 203k miles, AT, owned since 2014
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