Just a refresher. Daimler Benz purchased Detroit Diesel a few years ago. Volvo bought Prevost a few years ago. Daimler Benz and Volvo are competitors worldwide, and it makes no sense to buy from your competitor when you already make a competing product.

Prevost probably does not have a huge engineering department so it takes a while to re-engineer things when this type of product change occurs. They can only change so many things at once.

Daimler-Benz markets their truck engines as MTU brand all over the world except North America where they still call them Detroit Diesel because of the reputation. The new Detroit Diesel engines are not Series 60 but a Mercedes product that is similar generally. In the marine marketplace in the USA, they still sell Detroit Diesel Series 60 engines labeled MTU.

I think the future of Detroit service is probably quite secure, although over time they might be called MTU, and all the newer products will be Mercedes built engines. Daimler benz is probably one of the srongest automotive companies in the world. I personally believe they bought Detroit Diesel more for the access to the US market through the service outlets than for the actual product. In fact, they probably felt it was a good way to eliminate a strong competitor.

The Series 60 as we know it is practically an orphan already, but is likely to be supported for a very long time. As are the 2 stroke diesels, which still have very widespread use in the marine applications (yachts). As an aside, they often get more than 1000 hp from the 8V92 engines, 2 big turbos and there is no overheating problem because there is all the cooling water you could desire available right under the boat, but you better not let the cooling water pump fail! Often boats will have two of these engines, and since the boat probably weighs 90,000 pounds and water makes a lot of drag, the engines will drive it at 25-30 mph flat out. Burning like 120 gallons per hour combined, no kidding! They usually operate the boat at about 18 mph where the fuel burn is better, like 75 gallons per hour. I only throw out these numbers for perspective, they are representative, each boat will be a little different.

My own personal preference is a Series 60 engine prior to the particulate filter technology being needed. The simplest, best fuel economy, and probably most reliable engine ever put in a Prevost coach.