Before you post your broken-down classic Volkswagen Beetle for sale or swap the air-cooled engine in your Volkswagen Bus for a Porsche or Subaru one, it might be worthwhile taking a crack at that original engine- it might surprise you! These robust little flat-four boxer engines have stood the test of time, known for their simplicity, reliability, and capability to be modified. With a little know-how, anyone can keep their classic VW air-cooled engine around for years to come.