mine leaked at around 100k.
In this case, I'll save you some money/time and agree with your mechanic. It's best to replace both to save on additional time spent going in there.
That's if you're gonna keep this car for the long run. If not, sell it now cuz that thing will leak and cost you a good amount of money.
2001 auto eshift, Mileage 107891, Joe Z intake, Enkei RS7 wheels 17x7 ET42 Silver w/Polished Lip, 215/45/17 Michelin pilot sport A/S3 tires, Tein S tech springs, Bilstein HD shocks, Figs front LCA #2 poly bushing, New OEM front ball joints, Figs Rear toe links, Eibach Rear sway bar, Figs Rear sway bar end links, Carbon fiber Rear strut bar, Figs Rear sport mega arms, Figs Rear knuckle bearings