Hmm, I could have sworn I started a thread a year or so back to ask at what mileage all E39 owners experienced cooling failure or replaced proactively before failure. I can't seem to locate it though. Still, I think many will agree that if you're above 80k on your original radiator, expansion tank etc. it's time for an overhaul. I suspicion 525's are not nearly as hard on the cooling systems as the others because I made it to 120k with no major failures and confirmed I still had the stock rad but at that point I was getting nervous and decided to go ahead and put in all new hoses, expansion tank, rad and water pump because I didn't want to end up stranded somewhere. Anyways goodluck with what you decide!
Mods: Shark Injected | Magnaflow Exhaust + Resonator | H&R Springs | Bilstein SP Shocks + Struts | TMS Power Pulleys
Eibach F+R Sways | BeastPower Brackets | M-Tech bumpers | Predator ICE V3 + HID Fogs | Eurodyne CF Hood | BSW Sub + Dice + spec dock
[---Quote (Originally by Tex330i)---
You can warranty a turd, that way when you have a problem you can exchange it for a new turd.---End Quote---