150k isnt a lot. i have 214k, i know there are a few guys here with more than i have...

take care of your motor, it is good for 300k+, beat it like many people do with gs-r's and if you dont wreck it sooner, it wont last past 175k.

do some regular tune up maint. like oil, cap rotor, plugs wires, fuel filter, air filter and if the timing belt and water pump havent been done (or you dont know when they were ) change them too. the car will last forever if you take care of it.