Originally Posted by ronrutmr2
2001 ZX3, 138,000 miles, still has original fluid....
Yea and if you replace your aging fluid with fresh OEM fill it'll probably reach 300K mi without showing any wear symptoms. The fluid does degrade and pick up particulate, so wear rate begins rising after the fluid sees 75Kmi or so. By the time you reach 150K on the original fluid, it isn't doing a good job of controlling wear so remaining life is probably cut in half.