Everything depemds on how it was driven and maintained before the 160,000 miles.
My 1992 SC400 had 135,000 on it when I bought it 3 months ago. Since then my buddy (a mechanic) and I have rebuilt/replaced what it needed. We replaced the Timing belt and water pump, etc. Shannon (my mechanic) says that while he was in the engine, he checked out everything that he could get to. He believes that this car is good for another 100,000 miles. I did get a folder of all the maintenance that the previous owner did while he had the SC400. Any way, the general impression is that these SC's engine and transmissions (auto) are particurlarly good and May run for more than 300,000 miles. It Must be regularly maintained, though.
TexasComputerMan