Only thing I can say is, its seems like no one knows how to work on them. When you call Mack tech support there is only like 2 people who can point you in the right direction.

I sold Mack trucks for 30 years. I would not buy any Mack mid liner trucks with Renault engines. These engines are horrible.

Any manufacturer that puts # 1 cylinder at the rear of the engine is lost. Nothing good ever came out of France.