Car searched for up to 4000€ for 24 months

Hello, I’m about to buy Bmw 316ti or drive and buy again. But now the salesman told me that the engine and gearbox are fruit and that’s supposed to be normal with the model or at 316ti! Can someone confirm this to me? Does he want to get rid of the vehicle and hang the body on my neck? What can the engine and gearbox be wet? Is it broken or broken?! Should I buy with or rather leave my hands off it????