BMW

BMW 3 Series E9x 
 E9x series with petrol engines, especially L4 N43, are known to have problems with oil leaks, water pump, cooling.. 
 inline 6 cylinder engines (325i) seems to be the best for car enthusiasts, but quite expesive to own 
 N43 and N53 use direct injection 
 N45, N46 and N52 engines use indirect injection 
 N46 found on pre-2018-facelift 318i 95 kW and 320i 110 kW 
 N52 found on pre-2018-facelift 330i 190 kW