How many hours will a Volvo marine diesel last?
Diesel engines when maintained properly can give you 6,000 to 8,000 hours of good use before needing a major overhaul. This means, some diesel engines can easily last the full lifetime of the boat.
How much horsepower does a 3.0 Volvo Penta have?
Volvo Penta 3.0GL (135-hp) | BoatTEST.
Is the Volvo Penta 5.7 a good engine?
The Vortec series 5.7 engines are very good and will run to 2500hrs or more. You can easily identify the engine by the bolts in the center of the valve covers. The TBI and MPI versions are very efficient as well. As others have said, exhaust manifolds, risers, and oil pans are the primary concern.