How much mileage would it take to make an engine not safe to boost?

 

the mileage doesnt matter really. bec it depends on how hard the engine was ran in the first place. ive seen cars with 130,000 on boost and there fine but really it has high mileage i would check everything and make sure the conditions are good b4. otherwise invest in new or rebuilt one. but i would go over 150,000 for sure. wont last long im sure. goodluck

 

It depends on your compression result. If your compression is good, you're good to go.