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Yep, see that now, my head cold is eating my brain away:
"Car is an '01 X5 4.4i with 80k on the clock."
At 80K, think engine exterior issues, all the above posts will guide you. Mostly it is just a simple inspect, test, and replace as necessary. Belts and hoses are cheap insurance as are the belt tensioners. When the belts are off the W/P will expose any bearing (really just a brass bushing) shaft play - Just wiggle the front shaft - Movement? Replace.
Internally there are cooling tubes that leak. I personally would pressure test the system before any parts replacement to see what if anything else is leaking. After that little test, everything that is replaced as a preventative is up to your skills and pockets.
When it comes to parts there are really two paths - OE/OE Replacement quality and lots of other untested/unknown and possibly really cheap stuff.
All of them will fit (mostly) the OE/OE Replacements will last a long time the others are just cheap to buy and maybe install. Lots of options.
Are you planning to DIY or have a shop do it for you (DIFM)?
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
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