It's an inherent design defect, the camshaft sits farther up in the engine block and the oil galleries do not supply the camshaft oil gallery properly. The Hellcat oil pump is a stop gap , the design is flawed not the pump but block design. Ram won't do anything about it and after this year the engine is no longer put in Rams.
This.
And any make of active displacement management or whatever they call it, will have issues. There are kits to delete it so it runs on all 8 like an engine should.
