What is the average amount of miles i will get out of the 2000 Cadillac STS?

I have a 2000 Cadillac STS with the GM specially made Northstar V8 in it. It currently has just over 150k on it, and has had regular maintenance, including oil chances with synthetic oil every 3-5 thousand miles. I was just curious as to how many miles more i can get out of it?
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