The only reason to prime the filter is so you don't have to run the engine for a few minutes after initial fill, stop it, pour another half quart or so to replace was the filter was filled with, check it, start it back up, stop it, check it again, etc.
It eliminates that middle step.
Priming an oil filter helps to reduce the metal-to-metal wear that occurs from a dry-start.
Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat