Mileage worry need big boost!

[ozonehostile]

Depends what sort of life the engine has had during those 172k miles. If Its always had regular oil changes, been warmed up and cooled down before and after any enthusiastic driving, then I dont see any reason why It would suddenly fail, just ease up the boost gently, give the engine chance to get run in running higher boost so you can find Any weakness before its too late. The xud is pretty solid if Its been looked after