Brian demonstrates how to test run an air-cooled VW engine outside of the vehicle. This is a very effective way to test for cracks in the engine case that cannot be seen once the engine is installed. You can also quickly check for and repair any oil leaks. Doing this while the engine is outside of the vehicle, will save you the hassle of installing the engine only to take it right back out because it leaks. When Brian has a customer interested in a rebuilt VW engine, he also uses this method to demonstrate the quality of the engine to the customer before it gets installed into their Volkswagen.