Ask Smithy Xtra Main bearings gone in Mazda 6

Missing oil changes can be fatal for engines, it can cause oil galleries to become clogged and affect the oil supply to vital components like the main bearings. It also gives the carmaker good justification for refusing to cover a repair that might have been caused because you’ve missed your oil changes. Presumably the engine has been pulled down, in which case you could have an engine reconditioner inspect it with a view to having it rebuilt. You could also appeal to Mazda for assistance in replacing or repairing the engine, but I doubt you would have any joy there.