I have to disagree with that, they (CAT) dropped out.
If that were the case and the Daimler Gang only wanted to sell the Detroit Diesel Engine then why is Daimler offering Cummins as a powerplant choice once again.
They will not drop something that sells well without a good reason. And if a fleet demands a certain powertrain then the OEM's will bust a nut to get it into a chassis.
Have even seen Freightliners factory equipped with Navistar/Spicer rears that a fleet customer demanded.
No joke.
I just went to the GM to confirm this and CAT did indeed step out. ACERT engines had a high failure rate and then when the '08's came out it got even worse.
I can assure you that PACCAR (Peterbilt and Kenworth) did not want CAT to get out of the game, they bought up every '08 CAT engine they could find and offered CAT power into '09 using the excess engines to get by.
We were distraught that CAT dropped out, had a huge market share up here.
Even with the ACERT issues they still have a loyal customer base.
CAT ACERT's do not hold up as well as the pre-emissions CAT engines in our vocational world. They can't even design an exhaust sleeve that wont fall apart and go thru both turbos. That makes for huge warranty claims.
They got tired of being on the hook for it and had way too much trouble meeting emissions.
I don't know how they plan to keep it up once the credits are used up.
JMHO.
Mike.