How many hours will a Mercruiser 4.3 last?
The average life for raw water cooled engines is 1,000-1,500 hours or less depending on how often they are used and how well they have been maintained.
How long do Mercruiser engines last?
The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions.
Who makes Mercruiser 4.3 engine?
Performance Product Technologies handles a variety of different Mercruiser 4.3L V6 Bobtail Engines and Longblocks. The GM 4.3L engine has been used in Marine Applications since 1986.