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Old 09-17-2018, 10:31 AM
Ricky Bobby's Avatar
Join Date: Dec 2011
Location: Wake Forest, NC
Posts: 9,332
Ricky Bobby will become famous soon enough
I've always been told once you see the hoses starting to turn brown from aged rubber it is a good time to replace them - Mine are about 7-8 years old and I may do them again proactively, along with the tank, and maybe the water pump and pulley (will go with EMP Stewart pump and OEM pulley)
2003 X5 3.0i 5-Speed - Born on 9/18/2003
105k miles -Topaz Blue/Schwarz/Titan Int. Trim/EHCII/Sport
Proud 3-Pedal owner, UUC SS/AFE/4.8iS Exhaust/Sharked
2013 X5 35D (CEO's) - Born on 5/17/2013 -
68k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards

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Old 09-17-2018, 11:02 AM
Join Date: Apr 2014
Location: Vancouver BC
Posts: 341
white46 is on a distinguished road
Originally Posted by cn90 View Post
- 2004 X5 2.5i with 84K miles...

- Both Upper and Lower Rad Hoses look fine, zero leaks, but I want to be proactive...

- Does anyone have any recommendation of when (years/mileage) to replace the hoses?

- If anyone has had a burst hose: when did it happen?
If you want replace them proactively, I would say 100k miles would be good time because I do see horror stories on hose bursting on e46fanatics.
Having said that, at 100k, if you don't have previous maintenance records, I would do whole cooling system refresh including water pump, thermostat, expansion tank, hoses.
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