What i the difference between the 318i and the 320, 325?

Hello, BMW used to be one of those delightful brands that uses a good naming convention for their cars. The "3" represented the series, while the next two numbers signified engine size: 1.8L, 2.0L, and 2.5L. The 318 was an I4, while the 320 and 325 were I6's. However, today the 318 is a 2.0L (as is the 320) and both are I4's. The 325 remains a 2.5-liter I6. Best of luck! CarGrrl

The 318 i is base model and much older. then the 320i still be made as of 2014 .The325i was the leading car for 20 years, with plenty if options ending in 2006. . .