Question: Preventive Maintenance - Radiator and Fan

[klebmw]

Hello all friends,
My 08 3.0si with 168K miles on and I drive this X5 every day to work. Since purchased this X5 when it was 65K Miles and I keep maintenance well. The truck is running smooth with no leak.

1. Water pump, belt/tensioner pulley replacement at 100K miles (maintenance)
2. Engine starter ignition replaced at 110K miles (failed)
3. Valve cover gasket, Oil filter housing gasket, Oil Pan gasket at 120K miles
(Valve cover gasket leak)
4. Lower control arms and struts at 125K miles (fail)
5. Sparks plugs and coils replaced 2nd time at 140K miles
6. Engine Manifold Gasket (leak and gas high mileage)
7. Fuel Pump replaced at 140K Miles
8. Alternator replaced at 145K Miles
9. Air blower motor etc.

I plan to drive this car for my upcoming 400 miles trip each way and I am thinking about replacing Radiator and fan since it has 168K mile on. However, Radiator is working good, no leak, and the radiator fan is working good also, kick on/off in time and no loud noise.

Do you think i should replace both of these since they are not failing? How often the radiator and fan failing on BMW E70?
The radiator fan is not cheap, which aftermarket fan brand is good beside OEM Brose?

Thank you!