I own a 2014 Ford Fiesta Titanium X 125 with the 1.0 Ecoboost engine. As the car is now four years old, I decided to service it myself this year. All went well until I removed the oil filter. As the filter canister seal parted with the cylinder block there was a distinct spurt of oil from the joint as if under pressure, there also seemed to be more oil loss from this than I am used to. The engine had been switched off for at least five minutes. Do you know if there is a system which maintains oil pressure in this engine after it has been shut down?
Ensuring the turbocharger on the Ecoboost engine is fed with oil pressure as soon as possible is an important feature of the design. For this reason, the metal canister filter on your Ecoboost engine does contain a valve to prevent back-flow and drain-down of oil when the engine is at rest. The valve also ensures that the filter is kept full at all times, and if the engine had only recently been run then the pressure would remain in the system for a while. This, coupled with the fact that the filter would have been full as opposed to drained down slightly, may have resulted in the spurting effect you experienced.