MTU Series 60 vs Volvo D-12

I had D12-800's for 6 years and put more than 1200 hrs on them. Very few problems. Contrary to what most people say...parts and service were easily available and not expensive. I have been told that a lot of long haul trucks use D12's and this helps supply and pricing. Never had any major problems. Oil leaks around pan and other seals typical and a nuisance. The series 60 gives an extra knot or two of top end speed, but fuel burn is 10-15% higher. I would recommend the Volvo based on my experience.

I have Volvo Tamd74's which are the prior gen. I have no experience with the MTUs although understand the have a solid rep. My Volvos have been good motors with no major issues at 3000hr mark (knock on wood). But I have had to replace some parts. Recently I waited 3 weeks for an oil cooler to come from Europe. And I have another minor part on back-order as well. Perhaps parts supply is better with the newer motors. I've also found the parts are pretty expensive. I haven't done an engine for engine comparison but I've had techs comment on how expensive some of this stuff is. Finally, service really depends on where you are. Any competent diesel tech can swap obvious parts. But if you need something Volvo specific, perhaps electrical, or needing diagnostics with a Vodia tool then you'll need someone Volvo certified. And those folks are generally not as plentiful as some of the other major players like MTU, CAT, Cummins, etc.