Although Mack excels in vocational applications, its 13-liter MP8 diesel can be spec’d with the company’s Econodyne fuel economy package for long-haul operations. The MP8 is rated from 415 to 505 horsepower with torque ratings ranging from 1,460 to 1,860 lb.-ft. The engine features a robust, single overhead cam design.
300-truck general freight carrier in Southeast
It’s a good engine. Tough. We don’t have a lot of trouble with it. We have had some fuel injector issues lately. But we have really good dealer support. They do a real good job backing us up.
The fuel economy is good – but up and down. We average about 7 mpg in the summer and about 6.7 mpg in the winter. Most of that has to do with the fuel blends, though, I think. But we run maxed out both coming and going. And it’s a good engine on that front. Decent mileage and very durable.
- Suitability for your application/business 4
- Overall reliability/durability 4
- Overall engine design 3
- Serviceability 4
- OEM support 4
- Dealer support 5
- Fuel economy 4
- Horsepower rating 4
- Torque rating 4
- Acquisition cost 4
- Resale value 3
15-truck tank fleet in Southeast
I like the M-Drive and for the most part they’ve been trouble free. We had an early unit that ran out of fluid – and we never could find any leak. Mack replaced it. But that was strange.
It’s a tough transmission. We’re a tanker fleet – haul gasoline – and it’s more than up to the job. The drivers always complain. Their biggest complaint is that the M-Drive gets them up into higher gears faster than they’d like. I try to tell them they’re not driving a race car. But they’re Old School and think they have to keep the engine wound up to get anything done. But when we have to bring in a rental truck with a manual transmission now, they whine about that and want the M-Drive. You can’t keep them happy.
- Suitability for your application/business 5
- Overall reliability/durability 5
- Overall engine design 5
- Serviceability 5
- OEM support 5
- Dealer support 5
- Fuel economy 3
- Horsepower rating 5
- Torque rating 5
- Acquisition cost 5
- Resale value 5