Personnally, nothing lasts "forever" - Even your body does a complete cell replacement every 7 years - new fluid can't hurt, but like everything else, it's all subjective (ie, how you drive, your climate, what the back of your mind tells you, etc)

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Mark _______________________________
2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2 , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT
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Life is not fair!
You can't protect people from their own stupidity!
Laughter makes life worth living