I’m really happy to find this best episode again! I also remembered someone pointed out that the story took place in 2006 which is the year Cars was released.
Gordon and Spencer finally understood that Both the A3s and the A4s presure boliers were worn out,Greasly think That "If Humans can get Old,why not Engines" and that's what he did,there pride and cocky atitude were replaced with betrayal and sorrow.
I’m not an expert, but I think the high pressure boiler (magically) affected all his parts so literally everything would need to be replaced. It would be cheaper and quicker to just make a new engine.
Well it’s not the boiler itself that is the problem it was what caused the problem. Victor said that Gordon’s boiler wore out the rest of his body so even if he got a new boiler (which that alone would be pretty expensive) it would be too late as all of his other parts are weak and worn out.